51499879 has 4 divisors (see below), whose sum is σ = 51549480. Its totient is φ = 51450280.

The previous prime is 51499859. The next prime is 51499883. The reversal of 51499879 is 97899415.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51499879 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 (51499859) 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, 23209 + ... + 25330.

It is an arithmetic number, because the mean of its divisors is an integer number (12887370).

Almost surely, 2^51499879 is an apocalyptic number.

51499879 is a deficient number, since it is larger than the sum of its proper divisors (49601).

51499879 is a wasteful number, since it uses less digits than its factorization.

51499879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49600.

The product of its digits is 816480, while the sum is 52.

The square root of 51499879 is about 7176.3416167292. The cubic root of 51499879 is about 372.0506516569.

The spelling of 51499879 in words is "fifty-one million, four hundred ninety-nine thousand, eight hundred seventy-nine".