31328013 has 4 divisors (see below), whose sum is σ = 41770688. Its totient is φ = 20885340.

The previous prime is 31327999. The next prime is 31328021. The reversal of 31328013 is 31082313.

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.

It is not a de Polignac number, because 31328013 - 2⁸ = 31327757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31328053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5221333 + ... + 5221338.

It is an arithmetic number, because the mean of its divisors is an integer number (10442672).

Almost surely, 2^31328013 is an apocalyptic number.

It is an amenable number.

31328013 is a deficient number, since it is larger than the sum of its proper divisors (10442675).

31328013 is a wasteful number, since it uses less digits than its factorization.

31328013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10442674.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 31328013 is about 5597.1432892146. The cubic root of 31328013 is about 315.2421519218.

The spelling of 31328013 in words is "thirty-one million, three hundred twenty-eight thousand, thirteen".