31310021031131 has 4 divisors (see below), whose sum is σ = 31327640628312. Its totient is φ = 31292401433952.

The previous prime is 31310021031109. The next prime is 31310021031227. The reversal of 31310021031131 is 13113012001313.

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

It is a cyclic number.

It is not a de Polignac number, because 31310021031131 - 2³⁸ = 31035143124187 is a prime.

It is a super-2 number, since 2×31310021031131² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31310021031101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8809795925 + ... + 8809799478.

It is an arithmetic number, because the mean of its divisors is an integer number (7831910157078).

Almost surely, 2^{31310021031131} is an apocalyptic number.

31310021031131 is a deficient number, since it is larger than the sum of its proper divisors (17619597181).

31310021031131 is a wasteful number, since it uses less digits than its factorization.

31310021031131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17619597180.

The product of its (nonzero) digits is 162, while the sum is 20.

Adding to 31310021031131 its reverse (13113012001313), we get a palindrome (44423033032444).

The spelling of 31310021031131 in words is "thirty-one trillion, three hundred ten billion, twenty-one million, thirty-one thousand, one hundred thirty-one".