51659799 has 4 divisors (see below), whose sum is σ = 68879736. Its totient is φ = 34439864.

The previous prime is 51659761. The next prime is 51659801. The reversal of 51659799 is 99795615.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51659799 - 2²³ = 43271191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51659749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8609964 + ... + 8609969.

It is an arithmetic number, because the mean of its divisors is an integer number (17219934).

Almost surely, 2^51659799 is an apocalyptic number.

51659799 is a deficient number, since it is larger than the sum of its proper divisors (17219937).

51659799 is a wasteful number, since it uses less digits than its factorization.

51659799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17219936.

The product of its digits is 765450, while the sum is 51.

The square root of 51659799 is about 7187.4751477831. The cubic root of 51659799 is about 372.4353571595.

The spelling of 51659799 in words is "fifty-one million, six hundred fifty-nine thousand, seven hundred ninety-nine".