51664289 has 4 divisors (see below), whose sum is σ = 51973824. Its totient is φ = 51354756.

The previous prime is 51664273. The next prime is 51664331. The reversal of 51664289 is 98246615.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51664289 - 2⁴ = 51664273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51664219) 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 3 ways as a sum of consecutive naturals, for example, 154517 + ... + 154850.

It is an arithmetic number, because the mean of its divisors is an integer number (12993456).

Almost surely, 2^51664289 is an apocalyptic number.

It is an amenable number.

51664289 is a deficient number, since it is larger than the sum of its proper divisors (309535).

51664289 is a wasteful number, since it uses less digits than its factorization.

51664289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309534.

The product of its digits is 103680, while the sum is 41.

The square root of 51664289 is about 7187.7874899026. The cubic root of 51664289 is about 372.4461468924.

The spelling of 51664289 in words is "fifty-one million, six hundred sixty-four thousand, two hundred eighty-nine".