57551231 has 4 divisors (see below), whose sum is σ = 57604512. Its totient is φ = 57497952.

The previous prime is 57551213. The next prime is 57551257. The reversal of 57551231 is 13215575.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57551231 is a prime.

It is a super-2 number, since 2×57551231² = 6624288379230722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 57551194 and 57551203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57551261) 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 3 ways as a sum of consecutive naturals, for example, 24986 + ... + 27191.

It is an arithmetic number, because the mean of its divisors is an integer number (14401128).

Almost surely, 2^57551231 is an apocalyptic number.

57551231 is a deficient number, since it is larger than the sum of its proper divisors (53281).

57551231 is a wasteful number, since it uses less digits than its factorization.

57551231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53280.

The product of its digits is 5250, while the sum is 29.

The square root of 57551231 is about 7586.2527640463. The cubic root of 57551231 is about 386.0867278075.

The spelling of 57551231 in words is "fifty-seven million, five hundred fifty-one thousand, two hundred thirty-one".