581812231 has 48 divisors (see below), whose sum is σ = 814036608. Its totient is φ = 408542400.

The previous prime is 581812213. The next prime is 581812261. The reversal of 581812231 is 132218185.

It is a de Polignac number, because none of the positive numbers 2^k-581812231 is a prime.

It is a super-2 number, since 2×581812231² = 677010944282394722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 581812193 and 581812202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581812261) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 300336 + ... + 302266.

It is an arithmetic number, because the mean of its divisors is an integer number (16959096).

Almost surely, 2^581812231 is an apocalyptic number.

581812231 is a deficient number, since it is larger than the sum of its proper divisors (232224377).

581812231 is a wasteful number, since it uses less digits than its factorization.

581812231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2012 (or 2005 counting only the distinct ones).

The product of its digits is 3840, while the sum is 31.

The square root of 581812231 is about 24120.7842119613. The cubic root of 581812231 is about 834.8227627695.

The spelling of 581812231 in words is "five hundred eighty-one million, eight hundred twelve thousand, two hundred thirty-one".