51187857 has 32 divisors (see below), whose sum is σ = 82114560. Its totient is φ = 27730560.

The previous prime is 51187847. The next prime is 51187861. The reversal of 51187857 is 75878115.

It is not a de Polignac number, because 51187857 - 2¹¹ = 51185809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51187847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62869 + ... + 63677.

It is an arithmetic number, because the mean of its divisors is an integer number (2566080).

Almost surely, 2^51187857 is an apocalyptic number.

It is an amenable number.

51187857 is a deficient number, since it is larger than the sum of its proper divisors (30926703).

51187857 is a wasteful number, since it uses less digits than its factorization.

51187857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973.

The product of its digits is 78400, while the sum is 42.

The square root of 51187857 is about 7154.5689597627. The cubic root of 51187857 is about 371.2977487361.

The spelling of 51187857 in words is "fifty-one million, one hundred eighty-seven thousand, eight hundred fifty-seven".