51405057 has 16 divisors (see below), whose sum is σ = 83079360. Its totient is φ = 31154400.

The previous prime is 51405049. The next prime is 51405073. The reversal of 51405057 is 75050415.

It is not a de Polignac number, because 51405057 - 2³ = 51405049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 51405057.

It is not an unprimeable number, because it can be changed into a prime (51405007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86244 + ... + 86837.

It is an arithmetic number, because the mean of its divisors is an integer number (5192460).

Almost surely, 2^51405057 is an apocalyptic number.

It is an amenable number.

51405057 is a deficient number, since it is larger than the sum of its proper divisors (31674303).

51405057 is a wasteful number, since it uses less digits than its factorization.

51405057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173101 (or 173095 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 51405057 is about 7169.7320033597. The cubic root of 51405057 is about 371.8221704676.

The spelling of 51405057 in words is "fifty-one million, four hundred five thousand, fifty-seven".