83956591 has 4 divisors (see below), whose sum is σ = 88895232. Its totient is φ = 79017952.

The previous prime is 83956571. The next prime is 83956651. The reversal of 83956591 is 19565938.

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 83956591 - 2¹¹ = 83954543 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 (83956501) 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, 2469295 + ... + 2469328.

It is an arithmetic number, because the mean of its divisors is an integer number (22223808).

Almost surely, 2^83956591 is an apocalyptic number.

83956591 is a deficient number, since it is larger than the sum of its proper divisors (4938641).

83956591 is a wasteful number, since it uses less digits than its factorization.

83956591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4938640.

The product of its digits is 291600, while the sum is 46.

The square root of 83956591 is about 9162.7829287832. The cubic root of 83956591 is about 437.8764602968.

The spelling of 83956591 in words is "eighty-three million, nine hundred fifty-six thousand, five hundred ninety-one".