31423557 has 8 divisors (see below), whose sum is σ = 45707040. Its totient is φ = 19044560.

The previous prime is 31423529. The next prime is 31423573. The reversal of 31423557 is 75532413.

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

It is a cyclic number.

It is not a de Polignac number, because 31423557 - 2¹⁰ = 31422533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31423517) 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, 476082 + ... + 476147.

It is an arithmetic number, because the mean of its divisors is an integer number (5713380).

Almost surely, 2^31423557 is an apocalyptic number.

It is an amenable number.

31423557 is a deficient number, since it is larger than the sum of its proper divisors (14283483).

31423557 is a wasteful number, since it uses less digits than its factorization.

31423557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952243.

The product of its digits is 12600, while the sum is 30.

The square root of 31423557 is about 5605.6718598220. The cubic root of 31423557 is about 315.5623012666.

It can be divided in two parts, 314 and 23557, that added together give a triangular number (23871 = T₂₁₈).

The spelling of 31423557 in words is "thirty-one million, four hundred twenty-three thousand, five hundred fifty-seven".