51817479 has 32 divisors (see below), whose sum is σ = 84188160. Its totient is φ = 27674112.

The previous prime is 51817471. The next prime is 51817483. The reversal of 51817479 is 97471815.

It is not a de Polignac number, because 51817479 - 2³ = 51817471 is a prime.

It is a super-2 number, since 2×51817479² = 5370102259830882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51817479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51817471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61342 + ... + 62180.

It is an arithmetic number, because the mean of its divisors is an integer number (2630880).

Almost surely, 2^51817479 is an apocalyptic number.

51817479 is a deficient number, since it is larger than the sum of its proper divisors (32370681).

51817479 is a wasteful number, since it uses less digits than its factorization.

51817479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039.

The product of its digits is 70560, while the sum is 42.

The square root of 51817479 is about 7198.4358717710. The cubic root of 51817479 is about 372.8138975360.

The spelling of 51817479 in words is "fifty-one million, eight hundred seventeen thousand, four hundred seventy-nine".