31304613 has 8 divisors (see below), whose sum is σ = 41782048. Its totient is φ = 20848464.

The previous prime is 31304597. The next prime is 31304617. The reversal of 31304613 is 31640313.

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

It is not a de Polignac number, because 31304613 - 2⁴ = 31304597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31304613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31304617) 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, 1495 + ... + 8052.

It is an arithmetic number, because the mean of its divisors is an integer number (5222756).

Almost surely, 2^31304613 is an apocalyptic number.

It is an amenable number.

31304613 is a deficient number, since it is larger than the sum of its proper divisors (10477435).

31304613 is a wasteful number, since it uses less digits than its factorization.

31304613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10643.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 31304613 is about 5595.0525466701. The cubic root of 31304613 is about 315.1636438705.

Adding to 31304613 its reverse (31640313), we get a palindrome (62944926).

The spelling of 31304613 in words is "thirty-one million, three hundred four thousand, six hundred thirteen".