83090991 has 8 divisors (see below), whose sum is σ = 111167280. Its totient is φ = 55204352.

The previous prime is 83090981. The next prime is 83090993. The reversal of 83090991 is 19909038.

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 83090991 - 2¹⁰ = 83089967 is a prime.

It is a super-2 number, since 2×83090991² = 13808225570724162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83090993) 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, 46386 + ... + 48143.

It is an arithmetic number, because the mean of its divisors is an integer number (13895910).

Almost surely, 2^83090991 is an apocalyptic number.

83090991 is a deficient number, since it is larger than the sum of its proper divisors (28076289).

83090991 is a wasteful number, since it uses less digits than its factorization.

83090991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94825.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 83090991 is about 9115.4259911427. The cubic root of 83090991 is about 436.3664102057.

The spelling of 83090991 in words is "eighty-three million, ninety thousand, nine hundred ninety-one".