51819975 has 18 divisors (see below), whose sum is σ = 92815736. Its totient is φ = 27637200.

The previous prime is 51819959. The next prime is 51819997. The reversal of 51819975 is 57991815.

It is not a de Polignac number, because 51819975 - 2⁴ = 51819959 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51819975.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 114931 + ... + 115380.

Almost surely, 2^51819975 is an apocalyptic number.

51819975 is a deficient number, since it is larger than the sum of its proper divisors (40995761).

51819975 is a wasteful number, since it uses less digits than its factorization.

51819975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230327 (or 230319 counting only the distinct ones).

The product of its digits is 113400, while the sum is 45.

The square root of 51819975 is about 7198.6092406798. The cubic root of 51819975 is about 372.8198834733.

The spelling of 51819975 in words is "fifty-one million, eight hundred nineteen thousand, nine hundred seventy-five".