31289013 has 48 divisors (see below), whose sum is σ = 54885376. Its totient is φ = 16796160.

The previous prime is 31289009. The next prime is 31289017. The reversal of 31289013 is 31098213.

It is an interprime number because it is at equal distance from previous prime (31289009) and next prime (31289017).

It is not a de Polignac number, because 31289013 - 2² = 31289009 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31289017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 72045 + ... + 72477.

Almost surely, 2^31289013 is an apocalyptic number.

It is an amenable number.

31289013 is a deficient number, since it is larger than the sum of its proper divisors (23596363).

31289013 is a wasteful number, since it uses less digits than its factorization.

31289013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514 (or 511 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 31289013 is about 5593.6582841643. The cubic root of 31289013 is about 315.1112834324. Note that the first 3 decimals are identical.

The spelling of 31289013 in words is "thirty-one million, two hundred eighty-nine thousand, thirteen".