31203513313431 has 16 divisors (see below), whose sum is σ = 44064396691200. Its totient is φ = 19573173733248.

The previous prime is 31203513313369. The next prime is 31203513313481. The reversal of 31203513313431 is 13431331530213.

It is a happy number.

It is not a de Polignac number, because 31203513313431 - 2⁴² = 26805466802327 is a prime.

It is a super-2 number, since 2×31203513313431² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31203513313392 and 31203513313401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31203513313481) 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, 85774321 + ... + 86137338.

It is an arithmetic number, because the mean of its divisors is an integer number (2754024793200).

Almost surely, 2^{31203513313431} is an apocalyptic number.

31203513313431 is a deficient number, since it is larger than the sum of its proper divisors (12860883377769).

31203513313431 is a wasteful number, since it uses less digits than its factorization.

31203513313431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171915238.

The product of its (nonzero) digits is 29160, while the sum is 33.

Adding to 31203513313431 its reverse (13431331530213), we get a palindrome (44634844843644).

The spelling of 31203513313431 in words is "thirty-one trillion, two hundred three billion, five hundred thirteen million, three hundred thirteen thousand, four hundred thirty-one".