87505189 has 2 divisors, whose sum is σ = 87505190. Its totient is φ = 87505188.

The previous prime is 87505181. The next prime is 87505199. The reversal of 87505189 is 98150578.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81902500 + 5602689 = 9050^2 + 2367^2 .

It is a cyclic number.

It is not a de Polignac number, because 87505189 - 2³ = 87505181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87505181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43752594 + 43752595.

It is an arithmetic number, because the mean of its divisors is an integer number (43752595).

Almost surely, 2^87505189 is an apocalyptic number.

It is an amenable number.

87505189 is a deficient number, since it is larger than the sum of its proper divisors (1).

87505189 is an equidigital number, since it uses as much as digits as its factorization.

87505189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 43.

The square root of 87505189 is about 9354.4208265397. The cubic root of 87505189 is about 443.9607765719.

The spelling of 87505189 in words is "eighty-seven million, five hundred five thousand, one hundred eighty-nine".