83504581 has 4 divisors (see below), whose sum is σ = 85446592. Its totient is φ = 81562572.

The previous prime is 83504569. The next prime is 83504587. The reversal of 83504581 is 18540538.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18540538 = 2 ⋅9270269.

It is not a de Polignac number, because 83504581 - 2⁷ = 83504453 is a prime.

It is a super-2 number, since 2×83504581² = 13946030095971122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83504587) 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, 970941 + ... + 971026.

It is an arithmetic number, because the mean of its divisors is an integer number (21361648).

Almost surely, 2^83504581 is an apocalyptic number.

It is an amenable number.

83504581 is a deficient number, since it is larger than the sum of its proper divisors (1942011).

83504581 is a wasteful number, since it uses less digits than its factorization.

83504581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1942010.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 83504581 is about 9138.0840989783. The cubic root of 83504581 is about 437.0892248870.

The spelling of 83504581 in words is "eighty-three million, five hundred four thousand, five hundred eighty-one".