31310212313 has 4 divisors (see below), whose sum is σ = 31328014080. Its totient is φ = 31292410548.

The previous prime is 31310212303. The next prime is 31310212321. The reversal of 31310212313 is 31321201313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31321201313 = 2803 ⋅11174171.

It is a cyclic number.

It is not a de Polignac number, because 31310212313 - 2³⁰ = 30236470489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31310212303) 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, 8898245 + ... + 8901762.

It is an arithmetic number, because the mean of its divisors is an integer number (7832003520).

Almost surely, 2^31310212313 is an apocalyptic number.

It is an amenable number.

31310212313 is a deficient number, since it is larger than the sum of its proper divisors (17801767).

31310212313 is a wasteful number, since it uses less digits than its factorization.

31310212313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17801766.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31310212313 its reverse (31321201313), we get a palindrome (62631413626).

The spelling of 31310212313 in words is "thirty-one billion, three hundred ten million, two hundred twelve thousand, three hundred thirteen".