87579209 has 2 divisors, whose sum is σ = 87579210. Its totient is φ = 87579208.

The previous prime is 87579197. The next prime is 87579241. The reversal of 87579209 is 90297578.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73479184 + 14100025 = 8572^2 + 3755^2 .

It is a cyclic number.

It is not a de Polignac number, because 87579209 - 2²⁴ = 70801993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87579299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43789604 + 43789605.

It is an arithmetic number, because the mean of its divisors is an integer number (43789605).

Almost surely, 2^87579209 is an apocalyptic number.

It is an amenable number.

87579209 is a deficient number, since it is larger than the sum of its proper divisors (1).

87579209 is an equidigital number, since it uses as much as digits as its factorization.

87579209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 47.

The square root of 87579209 is about 9358.3764083307. The cubic root of 87579209 is about 444.0859223509.

The spelling of 87579209 in words is "eighty-seven million, five hundred seventy-nine thousand, two hundred nine".