57455991 has 6 divisors (see below), whose sum is σ = 82992000. Its totient is φ = 38303988.

The previous prime is 57455987. The next prime is 57455999. The reversal of 57455991 is 19955475.

57455991 is a `hidden beast` number, since 5 + 7 + 4 + 559 + 91 = 666.

It is not a de Polignac number, because 57455991 - 2² = 57455987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57455999) 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 5 ways as a sum of consecutive naturals, for example, 3191991 + ... + 3192008.

It is an arithmetic number, because the mean of its divisors is an integer number (13832000).

Almost surely, 2^57455991 is an apocalyptic number.

57455991 is a deficient number, since it is larger than the sum of its proper divisors (25536009).

57455991 is a wasteful number, since it uses less digits than its factorization.

57455991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6384005 (or 6384002 counting only the distinct ones).

The product of its digits is 283500, while the sum is 45.

The square root of 57455991 is about 7579.9730210602. The cubic root of 57455991 is about 385.8736353348.

It can be divided in two parts, 574 and 55991, that added together give a palindrome (56565).

The spelling of 57455991 in words is "fifty-seven million, four hundred fifty-five thousand, nine hundred ninety-one".