51424857 has 48 divisors (see below), whose sum is σ = 84651840. Its totient is φ = 29808000.

The previous prime is 51424843. The next prime is 51424871. The reversal of 51424857 is 75842415.

It is an interprime number because it is at equal distance from previous prime (51424843) and next prime (51424871).

It is a de Polignac number, because none of the positive numbers 2^k-51424857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51424837) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 369894 + ... + 370032.

It is an arithmetic number, because the mean of its divisors is an integer number (1763580).

Almost surely, 2^51424857 is an apocalyptic number.

It is an amenable number.

51424857 is a deficient number, since it is larger than the sum of its proper divisors (33226983).

51424857 is a wasteful number, since it uses less digits than its factorization.

51424857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 291 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 51424857 is about 7171.1126751711. The cubic root of 51424857 is about 371.8699033456.

It can be divided in two parts, 5142 and 4857, that added together give a palindrome (9999).

The spelling of 51424857 in words is "fifty-one million, four hundred twenty-four thousand, eight hundred fifty-seven".