879221581 has 4 divisors (see below), whose sum is σ = 1004824672. Its totient is φ = 753618492.

The previous prime is 879221557. The next prime is 879221591. The reversal of 879221581 is 185122978.

It is a happy number.

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 879221581 - 2⁵ = 879221549 is a prime.

It is a super-2 number, since 2×879221581² = 1546061176992279122, 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 (879221501) 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, 62801535 + ... + 62801548.

It is an arithmetic number, because the mean of its divisors is an integer number (251206168).

Almost surely, 2^879221581 is an apocalyptic number.

It is an amenable number.

879221581 is a deficient number, since it is larger than the sum of its proper divisors (125603091).

879221581 is a wasteful number, since it uses less digits than its factorization.

879221581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125603090.

The product of its digits is 80640, while the sum is 43.

The square root of 879221581 is about 29651.6707960951. The cubic root of 879221581 is about 958.0013325847.

The spelling of 879221581 in words is "eight hundred seventy-nine million, two hundred twenty-one thousand, five hundred eighty-one".