55915897 has 2 divisors, whose sum is σ = 55915898. Its totient is φ = 55915896.

The previous prime is 55915861. The next prime is 55915913. The reversal of 55915897 is 79851955.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54228496 + 1687401 = 7364^2 + 1299^2 .

It is a cyclic number.

It is not a de Polignac number, because 55915897 - 2²³ = 47527289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55915897.

It is not a weakly prime, because it can be changed into another prime (55915297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27957948 + 27957949.

It is an arithmetic number, because the mean of its divisors is an integer number (27957949).

Almost surely, 2^55915897 is an apocalyptic number.

It is an amenable number.

55915897 is a deficient number, since it is larger than the sum of its proper divisors (1).

55915897 is an equidigital number, since it uses as much as digits as its factorization.

55915897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 567000, while the sum is 49.

The square root of 55915897 is about 7477.6932940580. The cubic root of 55915897 is about 382.3946129131.

The spelling of 55915897 in words is "fifty-five million, nine hundred fifteen thousand, eight hundred ninety-seven".