51664271 has 2 divisors, whose sum is σ = 51664272. Its totient is φ = 51664270.

The previous prime is 51664267. The next prime is 51664273. The reversal of 51664271 is 17246615.

51664271 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51664271 - 2² = 51664267 is a prime.

It is a super-2 number, since 2×51664271² = 5338393795922882, which contains 22 as substring.

Together with 51664273, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51664273) 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 as a sum of consecutive naturals, namely, 25832135 + 25832136.

It is an arithmetic number, because the mean of its divisors is an integer number (25832136).

Almost surely, 2^51664271 is an apocalyptic number.

51664271 is a deficient number, since it is larger than the sum of its proper divisors (1).

51664271 is an equidigital number, since it uses as much as digits as its factorization.

51664271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

The square root of 51664271 is about 7187.7862377786. The cubic root of 51664271 is about 372.4461036386.

The spelling of 51664271 in words is "fifty-one million, six hundred sixty-four thousand, two hundred seventy-one".