31313321042 has 4 divisors (see below), whose sum is σ = 46969981566. Its totient is φ = 15656660520.

The previous prime is 31313321009. The next prime is 31313321077. The reversal of 31313321042 is 24012331313.

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

It can be written as a sum of positive squares in only one way, i.e., 20096181121 + 11217139921 = 141761^2 + 105911^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31313320999 and 31313321017.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7828330259 + ... + 7828330262.

Almost surely, 2^31313321042 is an apocalyptic number.

31313321042 is a deficient number, since it is larger than the sum of its proper divisors (15656660524).

31313321042 is a wasteful number, since it uses less digits than its factorization.

31313321042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15656660523.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 31313321042 its reverse (24012331313), we get a palindrome (55325652355).

The spelling of 31313321042 in words is "thirty-one billion, three hundred thirteen million, three hundred twenty-one thousand, forty-two".