51664971 has 8 divisors (see below), whose sum is σ = 72512320. Its totient is φ = 32630472.

The previous prime is 51664939. The next prime is 51664981. The reversal of 51664971 is 17946615.

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

It is not a de Polignac number, because 51664971 - 2⁵ = 51664939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51664931) 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 7 ways as a sum of consecutive naturals, for example, 453145 + ... + 453258.

It is an arithmetic number, because the mean of its divisors is an integer number (9064040).

Almost surely, 2^51664971 is an apocalyptic number.

51664971 is a deficient number, since it is larger than the sum of its proper divisors (20847349).

51664971 is a wasteful number, since it uses less digits than its factorization.

51664971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906425.

The product of its digits is 45360, while the sum is 39.

The square root of 51664971 is about 7187.8349313267. The cubic root of 51664971 is about 372.4477857237.

The spelling of 51664971 in words is "fifty-one million, six hundred sixty-four thousand, nine hundred seventy-one".