55945217 has 2 divisors, whose sum is σ = 55945218. Its totient is φ = 55945216.

The previous prime is 55945207. The next prime is 55945247. The reversal of 55945217 is 71254955.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50751376 + 5193841 = 7124^2 + 2279^2 .

It is a cyclic number.

It is not a de Polignac number, because 55945217 - 2⁸ = 55944961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55945207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27972608 + 27972609.

It is an arithmetic number, because the mean of its divisors is an integer number (27972609).

Almost surely, 2^55945217 is an apocalyptic number.

It is an amenable number.

55945217 is a deficient number, since it is larger than the sum of its proper divisors (1).

55945217 is an equidigital number, since it uses as much as digits as its factorization.

55945217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63000, while the sum is 38.

The square root of 55945217 is about 7479.6535347568. The cubic root of 55945217 is about 382.4614385777.

The spelling of 55945217 in words is "fifty-five million, nine hundred forty-five thousand, two hundred seventeen".