55117397 has 2 divisors, whose sum is σ = 55117398. Its totient is φ = 55117396.

The previous prime is 55117373. The next prime is 55117441. The reversal of 55117397 is 79371155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53377636 + 1739761 = 7306^2 + 1319^2 .

It is a cyclic number.

It is not a de Polignac number, because 55117397 - 2²⁰ = 54068821 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55117397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55117327) 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, 27558698 + 27558699.

It is an arithmetic number, because the mean of its divisors is an integer number (27558699).

Almost surely, 2^55117397 is an apocalyptic number.

It is an amenable number.

55117397 is a deficient number, since it is larger than the sum of its proper divisors (1).

55117397 is an equidigital number, since it uses as much as digits as its factorization.

55117397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33075, while the sum is 38.

The square root of 55117397 is about 7424.1091721499. The cubic root of 55117397 is about 380.5656327032.

The spelling of 55117397 in words is "fifty-five million, one hundred seventeen thousand, three hundred ninety-seven".