55398569 has 2 divisors, whose sum is σ = 55398570. Its totient is φ = 55398568.

The previous prime is 55398533. The next prime is 55398593. The reversal of 55398569 is 96589355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50580544 + 4818025 = 7112^2 + 2195^2 .

It is a cyclic number.

It is not a de Polignac number, because 55398569 - 2¹² = 55394473 is a prime.

It is a super-2 number, since 2×55398569² = 6138002894495522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55398769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27699284 + 27699285.

It is an arithmetic number, because the mean of its divisors is an integer number (27699285).

Almost surely, 2^55398569 is an apocalyptic number.

It is an amenable number.

55398569 is a deficient number, since it is larger than the sum of its proper divisors (1).

55398569 is an equidigital number, since it uses as much as digits as its factorization.

55398569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1458000, while the sum is 50.

The square root of 55398569 is about 7443.0214966773. The cubic root of 55398569 is about 381.2116656252.

The spelling of 55398569 in words is "fifty-five million, three hundred ninety-eight thousand, five hundred sixty-nine".