81590083 has 4 divisors (see below), whose sum is σ = 81683368. Its totient is φ = 81496800.

The previous prime is 81590057. The next prime is 81590099. The reversal of 81590083 is 38009518.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81590083 - 2⁵ = 81590051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81590053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45318 + ... + 47083.

It is an arithmetic number, because the mean of its divisors is an integer number (20420842).

Almost surely, 2^81590083 is an apocalyptic number.

81590083 is a deficient number, since it is larger than the sum of its proper divisors (93285).

81590083 is an equidigital number, since it uses as much as digits as its factorization.

81590083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93284.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 81590083 is about 9032.7229006540. The cubic root of 81590083 is about 433.7230052381.

The spelling of 81590083 in words is "eighty-one million, five hundred ninety thousand, eighty-three".