87165691 has 2 divisors, whose sum is σ = 87165692. Its totient is φ = 87165690.

The previous prime is 87165667. The next prime is 87165703. The reversal of 87165691 is 19656178.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87165691 - 2¹⁵ = 87132923 is a prime.

It is not a weakly prime, because it can be changed into another prime (87165641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43582845 + 43582846.

It is an arithmetic number, because the mean of its divisors is an integer number (43582846).

Almost surely, 2^87165691 is an apocalyptic number.

87165691 is a deficient number, since it is larger than the sum of its proper divisors (1).

87165691 is an equidigital number, since it uses as much as digits as its factorization.

87165691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 87165691 is about 9336.2567980963. The cubic root of 87165691 is about 443.3858806063.

The spelling of 87165691 in words is "eighty-seven million, one hundred sixty-five thousand, six hundred ninety-one".