31445013 has 4 divisors (see below), whose sum is σ = 41926688. Its totient is φ = 20963340.

The previous prime is 31445009. The next prime is 31445017. The reversal of 31445013 is 31054413.

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 an interprime number because it is at equal distance from previous prime (31445009) and next prime (31445017).

It is not a de Polignac number, because 31445013 - 2² = 31445009 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 (31445017) 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, 5240833 + ... + 5240838.

It is an arithmetic number, because the mean of its divisors is an integer number (10481672).

Almost surely, 2^31445013 is an apocalyptic number.

It is an amenable number.

31445013 is a deficient number, since it is larger than the sum of its proper divisors (10481675).

31445013 is a wasteful number, since it uses less digits than its factorization.

31445013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10481674.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 31445013 is about 5607.5853092040. The cubic root of 31445013 is about 315.6341068901.

Adding to 31445013 its reverse (31054413), we get a palindrome (62499426).

The spelling of 31445013 in words is "thirty-one million, four hundred forty-five thousand, thirteen".