51699839 has 8 divisors (see below), whose sum is σ = 55060560. Its totient is φ = 48374656.

The previous prime is 51699821. The next prime is 51699887. The reversal of 51699839 is 93899615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51699839 - 2²⁴ = 34922623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51699139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5849 + ... + 11730.

It is an arithmetic number, because the mean of its divisors is an integer number (6882570).

Almost surely, 2^51699839 is an apocalyptic number.

51699839 is a deficient number, since it is larger than the sum of its proper divisors (3360721).

51699839 is a wasteful number, since it uses less digits than its factorization.

51699839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17769.

The product of its digits is 524880, while the sum is 50.

The square root of 51699839 is about 7190.2600092069. The cubic root of 51699839 is about 372.5315535633.

The spelling of 51699839 in words is "fifty-one million, six hundred ninety-nine thousand, eight hundred thirty-nine".