31012513 has 16 divisors (see below), whose sum is σ = 36881280. Its totient is φ = 25514496.

The previous prime is 31012483. The next prime is 31012561. The reversal of 31012513 is 31521013.

It is not a de Polignac number, because 31012513 - 2⁵ = 31012481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31012013) 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 15 ways as a sum of consecutive naturals, for example, 45745 + ... + 46417.

It is an arithmetic number, because the mean of its divisors is an integer number (2305080).

Almost surely, 2^31012513 is an apocalyptic number.

It is an amenable number.

31012513 is a deficient number, since it is larger than the sum of its proper divisors (5868767).

31012513 is a wasteful number, since it uses less digits than its factorization.

31012513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 31012513 is about 5568.8879500310. The cubic root of 31012513 is about 314.1803263235.

Adding to 31012513 its reverse (31521013), we get a palindrome (62533526).

The spelling of 31012513 in words is "thirty-one million, twelve thousand, five hundred thirteen".