55239057 has 8 divisors (see below), whose sum is σ = 81835680. Its totient is φ = 36826020.

The previous prime is 55239049. The next prime is 55239059. The reversal of 55239057 is 75093255.

It is not a de Polignac number, because 55239057 - 2³ = 55239049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55239059) 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, 1022919 + ... + 1022972.

It is an arithmetic number, because the mean of its divisors is an integer number (10229460).

Almost surely, 2^55239057 is an apocalyptic number.

It is an amenable number.

55239057 is a deficient number, since it is larger than the sum of its proper divisors (26596623).

55239057 is a wasteful number, since it uses less digits than its factorization.

55239057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045900 (or 2045894 counting only the distinct ones).

The product of its (nonzero) digits is 47250, while the sum is 36.

The square root of 55239057 is about 7432.2982313683. The cubic root of 55239057 is about 380.8454329935.

The spelling of 55239057 in words is "fifty-five million, two hundred thirty-nine thousand, fifty-seven".