51659967 has 4 divisors (see below), whose sum is σ = 68879960. Its totient is φ = 34439976.

The previous prime is 51659963. The next prime is 51659977. The reversal of 51659967 is 76995615.

51659967 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 51659967 - 2² = 51659963 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 (51659963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8609992 + ... + 8609997.

It is an arithmetic number, because the mean of its divisors is an integer number (17219990).

Almost surely, 2^51659967 is an apocalyptic number.

51659967 is a deficient number, since it is larger than the sum of its proper divisors (17219993).

51659967 is a wasteful number, since it uses less digits than its factorization.

51659967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17219992.

The product of its digits is 510300, while the sum is 48.

The square root of 51659967 is about 7187.4868347706. The cubic root of 51659967 is about 372.4357608846.

The spelling of 51659967 in words is "fifty-one million, six hundred fifty-nine thousand, nine hundred sixty-seven".