51439475 has 12 divisors (see below), whose sum is σ = 65985360. Its totient is φ = 39732000.

The previous prime is 51439471. The next prime is 51439489. The reversal of 51439475 is 57493415.

It is not a de Polignac number, because 51439475 - 2² = 51439471 is a prime.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (51439471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34751 + ... + 36200.

It is an arithmetic number, because the mean of its divisors is an integer number (5498780).

Almost surely, 2^51439475 is an apocalyptic number.

51439475 is a deficient number, since it is larger than the sum of its proper divisors (14545885).

51439475 is a wasteful number, since it uses less digits than its factorization.

51439475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70990 (or 70985 counting only the distinct ones).

The product of its digits is 75600, while the sum is 38.

The square root of 51439475 is about 7172.1318309133. The cubic root of 51439475 is about 371.9051358484.

The spelling of 51439475 in words is "fifty-one million, four hundred thirty-nine thousand, four hundred seventy-five".