87583891 has 2 divisors, whose sum is σ = 87583892. Its totient is φ = 87583890.

The previous prime is 87583883. The next prime is 87583933. The reversal of 87583891 is 19838578.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87583891 - 2³ = 87583883 is a prime.

It is not a weakly prime, because it can be changed into another prime (87583591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43791945 + 43791946.

It is an arithmetic number, because the mean of its divisors is an integer number (43791946).

Almost surely, 2^87583891 is an apocalyptic number.

87583891 is a deficient number, since it is larger than the sum of its proper divisors (1).

87583891 is an equidigital number, since it uses as much as digits as its factorization.

87583891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 49.

The square root of 87583891 is about 9358.6265552163. The cubic root of 87583891 is about 444.0938358472.

The spelling of 87583891 in words is "eighty-seven million, five hundred eighty-three thousand, eight hundred ninety-one".