31257055 has 8 divisors (see below), whose sum is σ = 37630944. Its totient is φ = 24924000.

The previous prime is 31257049. The next prime is 31257059. The reversal of 31257055 is 55075213.

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

It is not a de Polignac number, because 31257055 - 2²¹ = 29159903 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 (31257059) 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, 8496 + ... + 11605.

It is an arithmetic number, because the mean of its divisors is an integer number (4703868).

Almost surely, 2^31257055 is an apocalyptic number.

31257055 is a deficient number, since it is larger than the sum of its proper divisors (6373889).

31257055 is a wasteful number, since it uses less digits than its factorization.

31257055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20417.

The product of its (nonzero) digits is 5250, while the sum is 28.

The square root of 31257055 is about 5590.8009265221. The cubic root of 31257055 is about 315.0039640049.

The spelling of 31257055 in words is "thirty-one million, two hundred fifty-seven thousand, fifty-five".