31275213 has 8 divisors (see below), whose sum is σ = 41776608. Its totient is φ = 20811984.

The previous prime is 31275199. The next prime is 31275221. The reversal of 31275213 is 31257213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31275213 - 2⁶ = 31275149 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31275913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7570 + ... + 10947.

It is an arithmetic number, because the mean of its divisors is an integer number (5222076).

Almost surely, 2^31275213 is an apocalyptic number.

It is an amenable number.

31275213 is a deficient number, since it is larger than the sum of its proper divisors (10501395).

31275213 is a wasteful number, since it uses less digits than its factorization.

31275213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19083.

The product of its digits is 1260, while the sum is 24.

The square root of 31275213 is about 5592.4246083430. The cubic root of 31275213 is about 315.0649500738.

The spelling of 31275213 in words is "thirty-one million, two hundred seventy-five thousand, two hundred thirteen".