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2049204781 = 133761211331
BaseRepresentation
bin111101000100100…
…0110001000101101
312021210221101111101
41322021012020231
513144044023111
6535201323101
7101531644651
oct17211061055
95253841441
102049204781
119617a4978
12492336491
13268714810
14156226a61
15bed81bc1
hex7a24622d

2049204781 has 32 divisors (see below), whose sum is σ = 2321545856. Its totient is φ = 1796256000.

The previous prime is 2049204733. The next prime is 2049204799. The reversal of 2049204781 is 1874029402.

It is a cyclic number.

It is not a de Polignac number, because 2049204781 - 229 = 1512333869 is a prime.

It is a super-2 number, since 2×20492047812 = 8398480468946515922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2049204781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2049204721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6190786 + ... + 6191116.

It is an arithmetic number, because the mean of its divisors is an integer number (72548308).

It is a Poulet number, since it divides 22049204780-1.

Almost surely, 22049204781 is an apocalyptic number.

It is an amenable number.

2049204781 is a deficient number, since it is larger than the sum of its proper divisors (272341075).

2049204781 is a wasteful number, since it uses less digits than its factorization.

2049204781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 2049204781 is about 45268.1431141150. The cubic root of 2049204781 is about 1270.1698123730.

The spelling of 2049204781 in words is "two billion, forty-nine million, two hundred four thousand, seven hundred eighty-one".

Divisors: 1 13 37 61 211 331 481 793 2257 2743 4303 7807 12247 12871 20191 29341 69841 101491 159211 167323 262483 476227 747067 907933 2584117 4260301 6190951 9711871 33593521 55383913 157631137 2049204781