87555569 has 2 divisors, whose sum is σ = 87555570. Its totient is φ = 87555568.

The previous prime is 87555547. The next prime is 87555581. The reversal of 87555569 is 96555578.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46403344 + 41152225 = 6812^2 + 6415^2 .

It is a cyclic number.

It is not a de Polignac number, because 87555569 - 2¹² = 87551473 is a prime.

It is a super-2 number, since 2×87555569² = 15331955325827522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87555509) 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, 43777784 + 43777785.

It is an arithmetic number, because the mean of its divisors is an integer number (43777785).

Almost surely, 2^87555569 is an apocalyptic number.

It is an amenable number.

87555569 is a deficient number, since it is larger than the sum of its proper divisors (1).

87555569 is an equidigital number, since it uses as much as digits as its factorization.

87555569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1890000, while the sum is 50.

The square root of 87555569 is about 9357.1132834865. The cubic root of 87555569 is about 444.0459618167.

Subtracting 87555569 from its reverse (96555578), we obtain a palindrome (9000009).

The spelling of 87555569 in words is "eighty-seven million, five hundred fifty-five thousand, five hundred sixty-nine".