51442857 has 24 divisors (see below), whose sum is σ = 79555840. Its totient is φ = 33184080.

The previous prime is 51442843. The next prime is 51442871. The reversal of 51442857 is 75824415.

It is an interprime number because it is at equal distance from previous prime (51442843) and next prime (51442871).

It is not a de Polignac number, because 51442857 - 2¹⁰ = 51441833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51442057) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4119 + ... + 10947.

Almost surely, 2^51442857 is an apocalyptic number.

It is an amenable number.

51442857 is a deficient number, since it is larger than the sum of its proper divisors (28112983).

51442857 is an equidigital number, since it uses as much as digits as its factorization.

51442857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6875 (or 6863 counting only the distinct ones).

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

The square root of 51442857 is about 7172.3676007299. The cubic root of 51442857 is about 371.9132862401.

It can be divided in two parts, 5144 and 2857, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 51442857 in words is "fifty-one million, four hundred forty-two thousand, eight hundred fifty-seven".