31131312201 has 64 divisors (see below), whose sum is σ = 50893608960. Its totient is φ = 18650623680.

The previous prime is 31131312193. The next prime is 31131312239. The reversal of 31131312201 is 10221313113.

31131312201 is a `hidden beast` number, since 311 + 3 + 131 + 220 + 1 = 666.

It is not a de Polignac number, because 31131312201 - 2³ = 31131312193 is a prime.

It is a super-2 number, since 2×31131312201² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31131312701) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21513660 + ... + 21515106.

It is an arithmetic number, because the mean of its divisors is an integer number (795212640).

Almost surely, 2^31131312201 is an apocalyptic number.

It is an amenable number.

31131312201 is a deficient number, since it is larger than the sum of its proper divisors (19762296759).

31131312201 is a wasteful number, since it uses less digits than its factorization.

31131312201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251 (or 2245 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31131312201 its reverse (10221313113), we get a palindrome (41352625314).

The spelling of 31131312201 in words is "thirty-one billion, one hundred thirty-one million, three hundred twelve thousand, two hundred one".