83990591 has 8 divisors (see below), whose sum is σ = 91101024. Its totient is φ = 77121280.

The previous prime is 83990573. The next prime is 83990603. The reversal of 83990591 is 19509938.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 83990591 - 2²² = 79796287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83990521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59555 + ... + 60948.

It is an arithmetic number, because the mean of its divisors is an integer number (11387628).

Almost surely, 2^83990591 is an apocalyptic number.

83990591 is a deficient number, since it is larger than the sum of its proper divisors (7110433).

83990591 is a wasteful number, since it uses less digits than its factorization.

83990591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120561.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 83990591 is about 9164.6380725046. The cubic root of 83990591 is about 437.9355614355.

The spelling of 83990591 in words is "eighty-three million, nine hundred ninety thousand, five hundred ninety-one".