311391531381 has 64 divisors (see below), whose sum is σ = 483940620800. Its totient is φ = 174441185280.

The previous prime is 311391531371. The next prime is 311391531433. The reversal of 311391531381 is 183135193113.

It is not a de Polignac number, because 311391531381 - 2¹³ = 311391523189 is a prime.

It is a super-2 number, since 2×311391531381² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311391531361) 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, 102127545 + ... + 102130593.

It is an arithmetic number, because the mean of its divisors is an integer number (7561572200).

Almost surely, 2^311391531381 is an apocalyptic number.

It is an amenable number.

311391531381 is a deficient number, since it is larger than the sum of its proper divisors (172549089419).

311391531381 is a wasteful number, since it uses less digits than its factorization.

311391531381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3614.

The product of its digits is 29160, while the sum is 39.

The spelling of 311391531381 in words is "three hundred eleven billion, three hundred ninety-one million, five hundred thirty-one thousand, three hundred eighty-one".