87165389 has 2 divisors, whose sum is σ = 87165390. Its totient is φ = 87165388.

The previous prime is 87165319. The next prime is 87165413. The reversal of 87165389 is 98356178.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86955625 + 209764 = 9325^2 + 458^2 .

It is a cyclic number.

It is not a de Polignac number, because 87165389 - 2¹⁶ = 87099853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87165319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43582694 + 43582695.

It is an arithmetic number, because the mean of its divisors is an integer number (43582695).

Almost surely, 2^87165389 is an apocalyptic number.

It is an amenable number.

87165389 is a deficient number, since it is larger than the sum of its proper divisors (1).

87165389 is an equidigital number, since it uses as much as digits as its factorization.

87165389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The square root of 87165389 is about 9336.2406245769. The cubic root of 87165389 is about 443.3853685444.

The spelling of 87165389 in words is "eighty-seven million, one hundred sixty-five thousand, three hundred eighty-nine".