231531226 has 8 divisors (see below), whose sum is σ = 365575680. Its totient is φ = 109672668.

The previous prime is 231531217. The next prime is 231531227. The reversal of 231531226 is 622135132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×231531226² = 107213417226126152, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231531226.

It is not an unprimeable number, because it can be changed into a prime (231531227) 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, 3046426 + ... + 3046501.

It is an arithmetic number, because the mean of its divisors is an integer number (45696960).

Almost surely, 2^231531226 is an apocalyptic number.

231531226 is a deficient number, since it is larger than the sum of its proper divisors (134044454).

231531226 is a wasteful number, since it uses less digits than its factorization.

231531226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6092948.

The product of its digits is 2160, while the sum is 25.

The square root of 231531226 is about 15216.1501701317. The cubic root of 231531226 is about 614.0492291128.

Adding to 231531226 its reverse (622135132), we get a palindrome (853666358).

The spelling of 231531226 in words is "two hundred thirty-one million, five hundred thirty-one thousand, two hundred twenty-six".