31023213132131 has 4 divisors (see below), whose sum is σ = 33843505235064. Its totient is φ = 28202921029200.

The previous prime is 31023213131941. The next prime is 31023213132167. The reversal of 31023213132131 is 13123131232013.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31023213132131 is a prime.

It is a super-2 number, since 2×31023213132131² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31023213132131.

It is not an unprimeable number, because it can be changed into a prime (31023213137131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1410146051450 + ... + 1410146051471.

It is an arithmetic number, because the mean of its divisors is an integer number (8460876308766).

Almost surely, 2^{31023213132131} is an apocalyptic number.

31023213132131 is a deficient number, since it is larger than the sum of its proper divisors (2820292102933).

31023213132131 is a wasteful number, since it uses less digits than its factorization.

31023213132131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2820292102932.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 31023213132131 its reverse (13123131232013), we get a palindrome (44146344364144).

The spelling of 31023213132131 in words is "thirty-one trillion, twenty-three billion, two hundred thirteen million, one hundred thirty-two thousand, one hundred thirty-one".