55317817 has 2 divisors, whose sum is σ = 55317818. Its totient is φ = 55317816.

The previous prime is 55317811. The next prime is 55317833. The reversal of 55317817 is 71871355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50282281 + 5035536 = 7091^2 + 2244^2 .

It is a cyclic number.

It is not a de Polignac number, because 55317817 - 2³ = 55317809 is a prime.

It is not a weakly prime, because it can be changed into another prime (55317811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27658908 + 27658909.

It is an arithmetic number, because the mean of its divisors is an integer number (27658909).

Almost surely, 2^55317817 is an apocalyptic number.

It is an amenable number.

55317817 is a deficient number, since it is larger than the sum of its proper divisors (1).

55317817 is an equidigital number, since it uses as much as digits as its factorization.

55317817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29400, while the sum is 37.

The square root of 55317817 is about 7437.5948397315. The cubic root of 55317817 is about 381.0263505265.

The spelling of 55317817 in words is "fifty-five million, three hundred seventeen thousand, eight hundred seventeen".