581221690 has 16 divisors (see below), whose sum is σ = 1195656192. Its totient is φ = 199275984.

The previous prime is 581221679. The next prime is 581221747. The reversal of 581221690 is 96122185.

581221690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×581221690² = 675637305852912200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4151514 + ... + 4151653.

It is an arithmetic number, because the mean of its divisors is an integer number (74728512).

Almost surely, 2^581221690 is an apocalyptic number.

581221690 is an abundant number, since it is smaller than the sum of its proper divisors (614434502).

581221690 is a wasteful number, since it uses less digits than its factorization.

581221690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8303181.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 581221690 is about 24108.5397732837. The cubic root of 581221690 is about 834.5402180270.

The spelling of 581221690 in words is "five hundred eighty-one million, two hundred twenty-one thousand, six hundred ninety".