83555591 has 4 divisors (see below), whose sum is σ = 95492112. Its totient is φ = 71619072.

The previous prime is 83555587. The next prime is 83555609. The reversal of 83555591 is 19555538.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19555538 = 2 ⋅9777769.

It is not a de Polignac number, because 83555591 - 2² = 83555587 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 (83555501) 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, 5968250 + ... + 5968263.

It is an arithmetic number, because the mean of its divisors is an integer number (23873028).

Almost surely, 2^83555591 is an apocalyptic number.

83555591 is a deficient number, since it is larger than the sum of its proper divisors (11936521).

83555591 is a wasteful number, since it uses less digits than its factorization.

83555591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11936520.

The product of its digits is 135000, while the sum is 41.

The square root of 83555591 is about 9140.8747393234. The cubic root of 83555591 is about 437.1782075619.

The spelling of 83555591 in words is "eighty-three million, five hundred fifty-five thousand, five hundred ninety-one".