87130609 has 2 divisors, whose sum is σ = 87130610. Its totient is φ = 87130608.

The previous prime is 87130543. The next prime is 87130639. The reversal of 87130609 is 90603178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87011584 + 119025 = 9328^2 + 345^2 .

It is a cyclic number.

It is not a de Polignac number, because 87130609 - 2⁹ = 87130097 is a prime.

It is a super-3 number, since 3×87130609³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (87130639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43565304 + 43565305.

It is an arithmetic number, because the mean of its divisors is an integer number (43565305).

Almost surely, 2^87130609 is an apocalyptic number.

It is an amenable number.

87130609 is a deficient number, since it is larger than the sum of its proper divisors (1).

87130609 is an equidigital number, since it uses as much as digits as its factorization.

87130609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 87130609 is about 9334.3778046531. The cubic root of 87130609 is about 443.3263887330.

The spelling of 87130609 in words is "eighty-seven million, one hundred thirty thousand, six hundred nine".