55117957 has 2 divisors, whose sum is σ = 55117958. Its totient is φ = 55117956.

The previous prime is 55117949. The next prime is 55117987. The reversal of 55117957 is 75971155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54893281 + 224676 = 7409^2 + 474^2 .

It is a cyclic number.

It is not a de Polignac number, because 55117957 - 2³ = 55117949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55117987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27558978 + 27558979.

It is an arithmetic number, because the mean of its divisors is an integer number (27558979).

Almost surely, 2^55117957 is an apocalyptic number.

It is an amenable number.

55117957 is a deficient number, since it is larger than the sum of its proper divisors (1).

55117957 is an equidigital number, since it uses as much as digits as its factorization.

55117957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55125, while the sum is 40.

The square root of 55117957 is about 7424.1468870167. The cubic root of 55117957 is about 380.5669215645.

The spelling of 55117957 in words is "fifty-five million, one hundred seventeen thousand, nine hundred fifty-seven".