55705589 has 2 divisors, whose sum is σ = 55705590. Its totient is φ = 55705588.

The previous prime is 55705579. The next prime is 55705603. The reversal of 55705589 is 98550755.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28976689 + 26728900 = 5383^2 + 5170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55705589 is a prime.

It is a super-2 number, since 2×55705589² = 6206225291673842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55705519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27852794 + 27852795.

It is an arithmetic number, because the mean of its divisors is an integer number (27852795).

Almost surely, 2^55705589 is an apocalyptic number.

It is an amenable number.

55705589 is a deficient number, since it is larger than the sum of its proper divisors (1).

55705589 is an equidigital number, since it uses as much as digits as its factorization.

55705589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 315000, while the sum is 44.

The square root of 55705589 is about 7463.6176884940. The cubic root of 55705589 is about 381.9145962783.

The spelling of 55705589 in words is "fifty-five million, seven hundred five thousand, five hundred eighty-nine".