83920591 has 4 divisors (see below), whose sum is σ = 84110472. Its totient is φ = 83730712.

The previous prime is 83920579. The next prime is 83920601. The reversal of 83920591 is 19502938.

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 83920591 - 2⁵ = 83920559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83920591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83920541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94276 + ... + 95161.

It is an arithmetic number, because the mean of its divisors is an integer number (21027618).

Almost surely, 2^83920591 is an apocalyptic number.

83920591 is a deficient number, since it is larger than the sum of its proper divisors (189881).

83920591 is a wasteful number, since it uses less digits than its factorization.

83920591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189880.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 83920591 is about 9160.8182494797. The cubic root of 83920591 is about 437.8138652263.

The spelling of 83920591 in words is "eighty-three million, nine hundred twenty thousand, five hundred ninety-one".