87318529 has 2 divisors, whose sum is σ = 87318530. Its totient is φ = 87318528.

The previous prime is 87318521. The next prime is 87318551. The reversal of 87318529 is 92581378.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81866304 + 5452225 = 9048^2 + 2335^2 .

It is a cyclic number.

It is not a de Polignac number, because 87318529 - 2³ = 87318521 is a prime.

It is not a weakly prime, because it can be changed into another prime (87318521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43659264 + 43659265.

It is an arithmetic number, because the mean of its divisors is an integer number (43659265).

Almost surely, 2^87318529 is an apocalyptic number.

It is an amenable number.

87318529 is a deficient number, since it is larger than the sum of its proper divisors (1).

87318529 is an equidigital number, since it uses as much as digits as its factorization.

87318529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 43.

The square root of 87318529 is about 9344.4383993903. The cubic root of 87318529 is about 443.6448764010.

The spelling of 87318529 in words is "eighty-seven million, three hundred eighteen thousand, five hundred twenty-nine".