87518573 has 2 divisors, whose sum is σ = 87518574. Its totient is φ = 87518572.

The previous prime is 87518539. The next prime is 87518593. The reversal of 87518573 is 37581578.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83137924 + 4380649 = 9118^2 + 2093^2 .

It is a cyclic number.

It is not a de Polignac number, because 87518573 - 2²⁴ = 70741357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87518513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43759286 + 43759287.

It is an arithmetic number, because the mean of its divisors is an integer number (43759287).

Almost surely, 2^87518573 is an apocalyptic number.

It is an amenable number.

87518573 is a deficient number, since it is larger than the sum of its proper divisors (1).

87518573 is an equidigital number, since it uses as much as digits as its factorization.

87518573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 235200, while the sum is 44.

The square root of 87518573 is about 9355.1361828677. The cubic root of 87518573 is about 443.9834101558.

The spelling of 87518573 in words is "eighty-seven million, five hundred eighteen thousand, five hundred seventy-three".