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19990151 = 23869137
BaseRepresentation
bin100110001000…
…0011010000111
31101121121022222
41030100122013
520104141101
61552242555
7331625216
oct114203207
941547288
1019990151
1110313995
12684045b
1341ababc
14292507d
151b4d01b
hex1310687

19990151 has 4 divisors (see below), whose sum is σ = 20859312. Its totient is φ = 19120992.

The previous prime is 19990129. The next prime is 19990153. The reversal of 19990151 is 15109991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-19990151 is a prime.

It is a super-2 number, since 2×199901512 = 799212274005602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19990153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434546 + ... + 434591.

It is an arithmetic number, because the mean of its divisors is an integer number (5214828).

Almost surely, 219990151 is an apocalyptic number.

19990151 is a deficient number, since it is larger than the sum of its proper divisors (869161).

19990151 is an equidigital number, since it uses as much as digits as its factorization.

19990151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869160.

The product of its (nonzero) digits is 3645, while the sum is 35.

The square root of 19990151 is about 4471.0346677251. The cubic root of 19990151 is about 271.3971971783.

The spelling of 19990151 in words is "nineteen million, nine hundred ninety thousand, one hundred fifty-one".

Divisors: 1 23 869137 19990151