51289875 has 128 divisors (see below), whose sum is σ = 117411840. Its totient is φ = 21513600.

The previous prime is 51289871. The next prime is 51289879. The reversal of 51289875 is 57898215.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51289871) and next prime (51289879).

It is not a de Polignac number, because 51289875 - 2² = 51289871 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 51289875.

It is not an unprimeable number, because it can be changed into a prime (51289871) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 307042 + ... + 307208.

It is an arithmetic number, because the mean of its divisors is an integer number (917280).

Almost surely, 2^51289875 is an apocalyptic number.

51289875 is an abundant number, since it is smaller than the sum of its proper divisors (66121965).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51289875 is a wasteful number, since it uses less digits than its factorization.

51289875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 195 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The square root of 51289875 is about 7161.6949809385. The cubic root of 51289875 is about 371.5442519715.

The spelling of 51289875 in words is "fifty-one million, two hundred eighty-nine thousand, eight hundred seventy-five".