55731857 has 4 divisors (see below), whose sum is σ = 56645556. Its totient is φ = 54818160.

The previous prime is 55731839. The next prime is 55731869. The reversal of 55731857 is 75813755.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6507601 + 49224256 = 2551^2 + 7016^2 .

It is a cyclic number.

It is not a de Polignac number, because 55731857 - 2¹⁶ = 55666321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55731887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456758 + ... + 456879.

It is an arithmetic number, because the mean of its divisors is an integer number (14161389).

Almost surely, 2^55731857 is an apocalyptic number.

It is an amenable number.

55731857 is a deficient number, since it is larger than the sum of its proper divisors (913699).

55731857 is an equidigital number, since it uses as much as digits as its factorization.

55731857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913698.

The product of its digits is 147000, while the sum is 41.

The square root of 55731857 is about 7465.3772175289. The cubic root of 55731857 is about 381.9746175216.

The spelling of 55731857 in words is "fifty-five million, seven hundred thirty-one thousand, eight hundred fifty-seven".