51699 has 8 divisors (see below), whose sum is σ = 72640. Its totient is φ = 32616.

The previous prime is 51691. The next prime is 51713. The reversal of 51699 is 99615.

51699 = T₃₂ + T₃₃ + ... + T₆₉.

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

It is not a de Polignac number, because 51699 - 2³ = 51691 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 51699.

It is not an unprimeable number, because it can be changed into a prime (51691) 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, 397 + ... + 510.

It is an arithmetic number, because the mean of its divisors is an integer number (9080).

2⁵¹⁶⁹⁹ is an apocalyptic number.

51699 is a deficient number, since it is larger than the sum of its proper divisors (20941).

51699 is a wasteful number, since it uses less digits than its factorization.

51699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929.

The product of its digits is 2430, while the sum is 30.

The square root of 51699 is about 227.3741410099. The cubic root of 51699 is about 37.2529538369.

The spelling of 51699 in words is "fifty-one thousand, six hundred ninety-nine".