55247657 has 2 divisors, whose sum is σ = 55247658. Its totient is φ = 55247656.

The previous prime is 55247653. The next prime is 55247663. The reversal of 55247657 is 75674255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54523456 + 724201 = 7384^2 + 851^2 .

It is a cyclic number.

It is not a de Polignac number, because 55247657 - 2² = 55247653 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55247651) 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, 27623828 + 27623829.

It is an arithmetic number, because the mean of its divisors is an integer number (27623829).

Almost surely, 2^55247657 is an apocalyptic number.

It is an amenable number.

55247657 is a deficient number, since it is larger than the sum of its proper divisors (1).

55247657 is an equidigital number, since it uses as much as digits as its factorization.

55247657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 294000, while the sum is 41.

The square root of 55247657 is about 7432.8767647527. The cubic root of 55247657 is about 380.8651961885.

The spelling of 55247657 in words is "fifty-five million, two hundred forty-seven thousand, six hundred fifty-seven".