31313134121 has 8 divisors (see below), whose sum is σ = 31598236488. Its totient is φ = 31029264000.

The previous prime is 31313134081. The next prime is 31313134141. The reversal of 31313134121 is 12143131313.

It can be written as a sum of positive squares in 4 ways, for example, as 6786025 + 31306348096 = 2605^2 + 176936^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31313134121 - 2¹⁸ = 31312871977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31313134141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256970 + ... + 358691.

It is an arithmetic number, because the mean of its divisors is an integer number (3949779561).

Almost surely, 2^31313134121 is an apocalyptic number.

It is an amenable number.

31313134121 is a deficient number, since it is larger than the sum of its proper divisors (285102367).

31313134121 is a wasteful number, since it uses less digits than its factorization.

31313134121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616123.

The product of its digits is 648, while the sum is 23.

Adding to 31313134121 its reverse (12143131313), we get a palindrome (43456265434).

The spelling of 31313134121 in words is "thirty-one billion, three hundred thirteen million, one hundred thirty-four thousand, one hundred twenty-one".