31213457 has 8 divisors (see below), whose sum is σ = 34434720. Its totient is φ = 28056160.

The previous prime is 31213433. The next prime is 31213477. The reversal of 31213457 is 75431213.

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

It is not a de Polignac number, because 31213457 - 2⁶ = 31213393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31213417) 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 7 ways as a sum of consecutive naturals, for example, 14963 + ... + 16920.

It is an arithmetic number, because the mean of its divisors is an integer number (4304340).

Almost surely, 2^31213457 is an apocalyptic number.

It is an amenable number.

31213457 is a deficient number, since it is larger than the sum of its proper divisors (3221263).

31213457 is a wasteful number, since it uses less digits than its factorization.

31213457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31983.

The product of its digits is 2520, while the sum is 26.

The square root of 31213457 is about 5586.9004823784. The cubic root of 31213457 is about 314.8574377987.

The spelling of 31213457 in words is "thirty-one million, two hundred thirteen thousand, four hundred fifty-seven".