57239961 has 4 divisors (see below), whose sum is σ = 76319952. Its totient is φ = 38159972.

The previous prime is 57239953. The next prime is 57239993. The reversal of 57239961 is 16993275.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 57239961 - 2³ = 57239953 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (57239911) 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, 9539991 + ... + 9539996.

It is an arithmetic number, because the mean of its divisors is an integer number (19079988).

Almost surely, 2^57239961 is an apocalyptic number.

It is an amenable number.

57239961 is a deficient number, since it is larger than the sum of its proper divisors (19079991).

57239961 is a wasteful number, since it uses less digits than its factorization.

57239961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19079990.

The product of its digits is 102060, while the sum is 42.

The square root of 57239961 is about 7565.7095503330. The cubic root of 57239961 is about 385.3894097864.

The spelling of 57239961 in words is "fifty-seven million, two hundred thirty-nine thousand, nine hundred sixty-one".