87858509 has 2 divisors, whose sum is σ = 87858510. Its totient is φ = 87858508.

The previous prime is 87858479. The next prime is 87858521. The reversal of 87858509 is 90585878.

87858509 is nontrivially palindromic in base 14.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80820100 + 7038409 = 8990^2 + 2653^2 .

It is a cyclic number.

It is not a de Polignac number, because 87858509 - 2¹² = 87854413 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87858559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43929254 + 43929255.

It is an arithmetic number, because the mean of its divisors is an integer number (43929255).

Almost surely, 2^87858509 is an apocalyptic number.

It is an amenable number.

87858509 is a deficient number, since it is larger than the sum of its proper divisors (1).

87858509 is an equidigital number, since it uses as much as digits as its factorization.

87858509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 806400, while the sum is 50.

The square root of 87858509 is about 9373.2869901652. The cubic root of 87858509 is about 444.5575014721.

The spelling of 87858509 in words is "eighty-seven million, eight hundred fifty-eight thousand, five hundred nine".