51642999 has 12 divisors (see below), whose sum is σ = 74895912. Its totient is φ = 34290000.

The previous prime is 51642979. The next prime is 51643037. The reversal of 51642999 is 99924615.

51642999 is a `hidden beast` number, since 516 + 42 + 9 + 99 = 666.

It is not a de Polignac number, because 51642999 - 2¹⁵ = 51610231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51642949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9172 + ... + 13689.

It is an arithmetic number, because the mean of its divisors is an integer number (6241326).

Almost surely, 2^51642999 is an apocalyptic number.

51642999 is a deficient number, since it is larger than the sum of its proper divisors (23252913).

51642999 is a wasteful number, since it uses less digits than its factorization.

51642999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23118 (or 23115 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 51642999 is about 7186.3063530579. The cubic root of 51642999 is about 372.3949802287.

The spelling of 51642999 in words is "fifty-one million, six hundred forty-two thousand, nine hundred ninety-nine".