87555509 has 2 divisors, whose sum is σ = 87555510. Its totient is φ = 87555508.

The previous prime is 87555487. The next prime is 87555511. The reversal of 87555509 is 90555578.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73702225 + 13853284 = 8585^2 + 3722^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87555509 is a prime.

Together with 87555511, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87555509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87555539) 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, 43777754 + 43777755.

It is an arithmetic number, because the mean of its divisors is an integer number (43777755).

Almost surely, 2^87555509 is an apocalyptic number.

It is an amenable number.

87555509 is a deficient number, since it is larger than the sum of its proper divisors (1).

87555509 is an equidigital number, since it uses as much as digits as its factorization.

87555509 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 87555509 is about 9357.1100773690. The cubic root of 87555509 is about 444.0458603848.

The spelling of 87555509 in words is "eighty-seven million, five hundred fifty-five thousand, five hundred nine".