55725521 has 2 divisors, whose sum is σ = 55725522. Its totient is φ = 55725520.

The previous prime is 55725511. The next prime is 55725529. The reversal of 55725521 is 12552755.

55725521 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., 31764496 + 23961025 = 5636^2 + 4895^2 .

It is a cyclic number.

It is not a de Polignac number, because 55725521 - 2²² = 51531217 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55725529) 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, 27862760 + 27862761.

It is an arithmetic number, because the mean of its divisors is an integer number (27862761).

Almost surely, 2^55725521 is an apocalyptic number.

It is an amenable number.

55725521 is a deficient number, since it is larger than the sum of its proper divisors (1).

55725521 is an equidigital number, since it uses as much as digits as its factorization.

55725521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17500, while the sum is 32.

The square root of 55725521 is about 7464.9528464686. The cubic root of 55725521 is about 381.9601417620.

The spelling of 55725521 in words is "fifty-five million, seven hundred twenty-five thousand, five hundred twenty-one".