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31211213201 = 767173384673
BaseRepresentation
bin11101000100010101…
…010101000110010001
32222120011101220112022
4131010111111012101
51002410032310301
622201020341225
72153304635450
oct350425250621
988504356468
1031211213201
1112266a09483
1260706a4815
132c352b43bc
141721256b97
15c2a12bd1b
hex744555191

31211213201 has 16 divisors (see below), whose sum is σ = 36411702144. Its totient is φ = 26200779264.

The previous prime is 31211213197. The next prime is 31211213203. The reversal of 31211213201 is 10231211213.

It is a cyclic number.

It is not a de Polignac number, because 31211213201 - 22 = 31211213197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31211213201.

It is not an unprimeable number, because it can be changed into a prime (31211213203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111200 + ... + 273473.

It is an arithmetic number, because the mean of its divisors is an integer number (2275731384).

Almost surely, 231211213201 is an apocalyptic number.

It is an amenable number.

31211213201 is a deficient number, since it is larger than the sum of its proper divisors (5200488943).

31211213201 is a wasteful number, since it uses less digits than its factorization.

31211213201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384920.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31211213201 its reverse (10231211213), we get a palindrome (41442424414).

The spelling of 31211213201 in words is "thirty-one billion, two hundred eleven million, two hundred thirteen thousand, two hundred one".

Divisors: 1 7 67 173 469 1211 11591 81137 384673 2692711 25773091 66548429 180411637 465839003 4458744743 31211213201