873506581 has 4 divisors (see below), whose sum is σ = 911485152. Its totient is φ = 835528012.

The previous prime is 873506549. The next prime is 873506587. The reversal of 873506581 is 185605378.

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.

It is a cyclic number.

It is not a de Polignac number, because 873506581 - 2⁵ = 873506549 is a prime.

It is a super-2 number, since 2×873506581² = 1526027494100619122, 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 (873506587) 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, 18989251 + ... + 18989296.

It is an arithmetic number, because the mean of its divisors is an integer number (227871288).

Almost surely, 2^873506581 is an apocalyptic number.

It is an amenable number.

873506581 is a deficient number, since it is larger than the sum of its proper divisors (37978571).

873506581 is a wasteful number, since it uses less digits than its factorization.

873506581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37978570.

The product of its (nonzero) digits is 201600, while the sum is 43.

The square root of 873506581 is about 29555.1447467273. The cubic root of 873506581 is about 955.9211276497.

The spelling of 873506581 in words is "eight hundred seventy-three million, five hundred six thousand, five hundred eighty-one".