55319917 has 2 divisors, whose sum is σ = 55319918. Its totient is φ = 55319916.

The previous prime is 55319881. The next prime is 55319923. The reversal of 55319917 is 71991355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51423241 + 3896676 = 7171^2 + 1974^2 .

It is a cyclic number.

It is not a de Polignac number, because 55319917 - 2¹⁵ = 55287149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55319917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55359917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27659958 + 27659959.

It is an arithmetic number, because the mean of its divisors is an integer number (27659959).

Almost surely, 2^55319917 is an apocalyptic number.

It is an amenable number.

55319917 is a deficient number, since it is larger than the sum of its proper divisors (1).

55319917 is an equidigital number, since it uses as much as digits as its factorization.

55319917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42525, while the sum is 40.

The square root of 55319917 is about 7437.7360130620. The cubic root of 55319917 is about 381.0311720304.

The spelling of 55319917 in words is "fifty-five million, three hundred nineteen thousand, nine hundred seventeen".