31321230313 has 4 divisors (see below), whose sum is σ = 31389767380. Its totient is φ = 31252693248.

The previous prime is 31321230299. The next prime is 31321230361. The reversal of 31321230313 is 31303212313.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22038293209 + 9282937104 = 148453^2 + 96348^2 .

It is a cyclic number.

It is not a de Polignac number, because 31321230313 - 2³³ = 22731295721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31321270313) 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, 34267848 + ... + 34268761.

It is an arithmetic number, because the mean of its divisors is an integer number (7847441845).

Almost surely, 2^31321230313 is an apocalyptic number.

It is an amenable number.

31321230313 is a deficient number, since it is larger than the sum of its proper divisors (68537067).

31321230313 is an equidigital number, since it uses as much as digits as its factorization.

31321230313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68537066.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 31321230313 its reverse (31303212313), we get a palindrome (62624442626).

The spelling of 31321230313 in words is "thirty-one billion, three hundred twenty-one million, two hundred thirty thousand, three hundred thirteen".