31321110131 has 16 divisors (see below), whose sum is σ = 34643801088. Its totient is φ = 28165737600.

The previous prime is 31321110127. The next prime is 31321110137. The reversal of 31321110131 is 13101112313.

It is a cyclic number.

It is not a de Polignac number, because 31321110131 - 2² = 31321110127 is a prime.

It is a super-2 number, since 2×31321110131² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31321110137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312236 + ... + 400166.

It is an arithmetic number, because the mean of its divisors is an integer number (2165237568).

Almost surely, 2^31321110131 is an apocalyptic number.

31321110131 is a deficient number, since it is larger than the sum of its proper divisors (3322690957).

31321110131 is a wasteful number, since it uses less digits than its factorization.

31321110131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88882.

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 31321110131 its reverse (13101112313), we get a palindrome (44422222444).

The spelling of 31321110131 in words is "thirty-one billion, three hundred twenty-one million, one hundred ten thousand, one hundred thirty-one".