31282013 has 4 divisors (see below), whose sum is σ = 35750880. Its totient is φ = 26813148.

The previous prime is 31281997. The next prime is 31282051. The reversal of 31282013 is 31028213.

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 a cyclic number.

It is not a de Polignac number, because 31282013 - 2⁴ = 31281997 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 (31282063) 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, 2234423 + ... + 2234436.

It is an arithmetic number, because the mean of its divisors is an integer number (8937720).

Almost surely, 2^31282013 is an apocalyptic number.

It is an amenable number.

31282013 is a deficient number, since it is larger than the sum of its proper divisors (4468867).

31282013 is an equidigital number, since it uses as much as digits as its factorization.

31282013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4468866.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 31282013 is about 5593.0325405812. The cubic root of 31282013 is about 315.0877827071.

The spelling of 31282013 in words is "thirty-one million, two hundred eighty-two thousand, thirteen".