51626521 has 2 divisors, whose sum is σ = 51626522. Its totient is φ = 51626520.

The previous prime is 51626489. The next prime is 51626551. The reversal of 51626521 is 12562615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44036496 + 7590025 = 6636^2 + 2755^2 .

It is a cyclic number.

It is not a de Polignac number, because 51626521 - 2⁵ = 51626489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51626521.

It is not a weakly prime, because it can be changed into another prime (51626551) 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 as a sum of consecutive naturals, namely, 25813260 + 25813261.

It is an arithmetic number, because the mean of its divisors is an integer number (25813261).

Almost surely, 2^51626521 is an apocalyptic number.

It is an amenable number.

51626521 is a deficient number, since it is larger than the sum of its proper divisors (1).

51626521 is an equidigital number, since it uses as much as digits as its factorization.

51626521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 28.

The square root of 51626521 is about 7185.1597755374. The cubic root of 51626521 is about 372.3553686817.

The spelling of 51626521 in words is "fifty-one million, six hundred twenty-six thousand, five hundred twenty-one".