31313200031 has 4 divisors (see below), whose sum is σ = 33155152992. Its totient is φ = 29471247072.

The previous prime is 31313200027. The next prime is 31313200033. The reversal of 31313200031 is 13000231313.

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

It is a cyclic number.

It is not a de Polignac number, because 31313200031 - 2² = 31313200027 is a prime.

It is a super-2 number, since 2×31313200031² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1841952943 = 31313200031 / (3 + 1 + 3 + 1 + 3 + 2 + 0 + 0 + 0 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31313199982 and 31313200009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313200033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 920976455 + ... + 920976488.

It is an arithmetic number, because the mean of its divisors is an integer number (8288788248).

Almost surely, 2^31313200031 is an apocalyptic number.

31313200031 is a deficient number, since it is larger than the sum of its proper divisors (1841952961).

31313200031 is a wasteful number, since it uses less digits than its factorization.

31313200031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841952960.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 31313200031 its reverse (13000231313), we get a palindrome (44313431344).

The spelling of 31313200031 in words is "thirty-one billion, three hundred thirteen million, two hundred thousand, thirty-one".