55397957 has 2 divisors, whose sum is σ = 55397958. Its totient is φ = 55397956.

The previous prime is 55397933. The next prime is 55397971. The reversal of 55397957 is 75979355.

55397957 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., 45576001 + 9821956 = 6751^2 + 3134^2 .

It is a cyclic number.

It is not a de Polignac number, because 55397957 - 2⁸ = 55397701 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55397987) 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, 27698978 + 27698979.

It is an arithmetic number, because the mean of its divisors is an integer number (27698979).

Almost surely, 2^55397957 is an apocalyptic number.

It is an amenable number.

55397957 is a deficient number, since it is larger than the sum of its proper divisors (1).

55397957 is an equidigital number, since it uses as much as digits as its factorization.

55397957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1488375, while the sum is 50.

The square root of 55397957 is about 7442.9803842278. The cubic root of 55397957 is about 381.2102618440.

The spelling of 55397957 in words is "fifty-five million, three hundred ninety-seven thousand, nine hundred fifty-seven".