87091793 has 2 divisors, whose sum is σ = 87091794. Its totient is φ = 87091792.

The previous prime is 87091787. The next prime is 87091819. The reversal of 87091793 is 39719078.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86638864 + 452929 = 9308^2 + 673^2 .

It is a cyclic number.

It is not a de Polignac number, because 87091793 - 2¹⁰ = 87090769 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (87091703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43545896 + 43545897.

It is an arithmetic number, because the mean of its divisors is an integer number (43545897).

Almost surely, 2^87091793 is an apocalyptic number.

It is an amenable number.

87091793 is a deficient number, since it is larger than the sum of its proper divisors (1).

87091793 is an equidigital number, since it uses as much as digits as its factorization.

87091793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 87091793 is about 9332.2983771416. The cubic root of 87091793 is about 443.2605461498.

The spelling of 87091793 in words is "eighty-seven million, ninety-one thousand, seven hundred ninety-three".