87509657 has 2 divisors, whose sum is σ = 87509658. Its totient is φ = 87509656.

The previous prime is 87509627. The next prime is 87509663. The reversal of 87509657 is 75690578.

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., 79192201 + 8317456 = 8899^2 + 2884^2 .

It is a cyclic number.

It is not a de Polignac number, because 87509657 - 2⁶ = 87509593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87509627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43754828 + 43754829.

It is an arithmetic number, because the mean of its divisors is an integer number (43754829).

Almost surely, 2^87509657 is an apocalyptic number.

It is an amenable number.

87509657 is a deficient number, since it is larger than the sum of its proper divisors (1).

87509657 is an equidigital number, since it uses as much as digits as its factorization.

87509657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 529200, while the sum is 47.

The square root of 87509657 is about 9354.6596410559. The cubic root of 87509657 is about 443.9683326304.

The spelling of 87509657 in words is "eighty-seven million, five hundred nine thousand, six hundred fifty-seven".