51599999 has 8 divisors (see below), whose sum is σ = 56456400. Its totient is φ = 46771200.

The previous prime is 51599993. The next prime is 51600007. The reversal of 51599999 is 99999515.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51599999 is a prime.

51599999 is a modest number, since divided by 9999 gives 5159 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51599993) 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, 2882 + ... + 10559.

It is an arithmetic number, because the mean of its divisors is an integer number (7057050).

Almost surely, 2^51599999 is an apocalyptic number.

51599999 is a deficient number, since it is larger than the sum of its proper divisors (4856401).

51599999 is a wasteful number, since it uses less digits than its factorization.

51599999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13801.

The product of its digits is 1476225, while the sum is 56.

The square root of 51599999 is about 7183.3139288214. The cubic root of 51599999 is about 372.2915946078.

The spelling of 51599999 in words is "fifty-one million, five hundred ninety-nine thousand, nine hundred ninety-nine".