51164521 has 2 divisors, whose sum is σ = 51164522. Its totient is φ = 51164520.

The previous prime is 51164471. The next prime is 51164527. The reversal of 51164521 is 12546115.

It is a happy number.

51164521 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 can be written as a sum of positive squares in only one way, i.e., 27154521 + 24010000 = 5211^2 + 4900^2 .

It is a cyclic number.

It is not a de Polignac number, because 51164521 - 2¹⁵ = 51131753 is a prime.

It is not a weakly prime, because it can be changed into another prime (51164527) 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, 25582260 + 25582261.

It is an arithmetic number, because the mean of its divisors is an integer number (25582261).

Almost surely, 2^51164521 is an apocalyptic number.

It is an amenable number.

51164521 is a deficient number, since it is larger than the sum of its proper divisors (1).

51164521 is an equidigital number, since it uses as much as digits as its factorization.

51164521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1200, while the sum is 25.

The square root of 51164521 is about 7152.9379278727. The cubic root of 51164521 is about 371.2413165937.

The spelling of 51164521 in words is "fifty-one million, one hundred sixty-four thousand, five hundred twenty-one".