31310113 has 4 divisors (see below), whose sum is σ = 31322368. Its totient is φ = 31297860.

The previous prime is 31310089. The next prime is 31310137. The reversal of 31310113 is 31101313.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (31310089) and next prime (31310137).

It is a cyclic number.

It is not a de Polignac number, because 31310113 - 2¹⁷ = 31179041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31310093 and 31310102.

It is not an unprimeable number, because it can be changed into a prime (31311113) 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, 681 + ... + 7942.

It is an arithmetic number, because the mean of its divisors is an integer number (7830592).

Almost surely, 2^31310113 is an apocalyptic number.

It is an amenable number.

31310113 is a deficient number, since it is larger than the sum of its proper divisors (12255).

31310113 is an equidigital number, since it uses as much as digits as its factorization.

31310113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12254.

The product of its (nonzero) digits is 27, while the sum is 13.

The square root of 31310113 is about 5595.5440307445. The cubic root of 31310113 is about 315.1821001338.

Adding to 31310113 its reverse (31101313), we get a palindrome (62411426).

The spelling of 31310113 in words is "thirty-one million, three hundred ten thousand, one hundred thirteen".