87040661 has 2 divisors, whose sum is σ = 87040662. Its totient is φ = 87040660.

The previous prime is 87040651. The next prime is 87040727. The reversal of 87040661 is 16604078.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82174225 + 4866436 = 9065^2 + 2206^2 .

It is a cyclic number.

It is not a de Polignac number, because 87040661 - 2¹⁰ = 87039637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87040651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43520330 + 43520331.

It is an arithmetic number, because the mean of its divisors is an integer number (43520331).

Almost surely, 2^87040661 is an apocalyptic number.

It is an amenable number.

87040661 is a deficient number, since it is larger than the sum of its proper divisors (1).

87040661 is an equidigital number, since it uses as much as digits as its factorization.

87040661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 87040661 is about 9329.5584568617. The cubic root of 87040661 is about 443.1737823862.

The spelling of 87040661 in words is "eighty-seven million, forty thousand, six hundred sixty-one".