51561057 has 8 divisors (see below), whose sum is σ = 68997376. Its totient is φ = 34249392.

The previous prime is 51561049. The next prime is 51561061. The reversal of 51561057 is 75016515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51561057 - 2³ = 51561049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51561047) 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, 30193 + ... + 31854.

It is an arithmetic number, because the mean of its divisors is an integer number (8624672).

Almost surely, 2^51561057 is an apocalyptic number.

It is an amenable number.

51561057 is a deficient number, since it is larger than the sum of its proper divisors (17436319).

51561057 is a wasteful number, since it uses less digits than its factorization.

51561057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62327.

The product of its (nonzero) digits is 5250, while the sum is 30.

The square root of 51561057 is about 7180.6028298465. The cubic root of 51561057 is about 372.1979161311.

The spelling of 51561057 in words is "fifty-one million, five hundred sixty-one thousand, fifty-seven".