31313200312031 has 16 divisors (see below), whose sum is σ = 34819211276928. Its totient is φ = 27917539821600.

The previous prime is 31313200311983. The next prime is 31313200312033. The reversal of 31313200312031 is 13021300231313.

It is not a de Polignac number, because 31313200312031 - 2¹⁴ = 31313200295647 is a prime.

It is a super-2 number, since 2×31313200312031² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31313200311988 and 31313200312006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313200312033) 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, 10074065 + ... + 12810666.

It is an arithmetic number, because the mean of its divisors is an integer number (2176200704808).

Almost surely, 2^{31313200312031} is an apocalyptic number.

31313200312031 is a deficient number, since it is larger than the sum of its proper divisors (3506010964897).

31313200312031 is a wasteful number, since it uses less digits than its factorization.

31313200312031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22887142.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 31313200312031 its reverse (13021300231313), we get a palindrome (44334500543344).

The spelling of 31313200312031 in words is "thirty-one trillion, three hundred thirteen billion, two hundred million, three hundred twelve thousand, thirty-one".