225231531 has 16 divisors (see below), whose sum is σ = 343785984. Its totient is φ = 128487744.

The previous prime is 225231527. The next prime is 225231533. The reversal of 225231531 is 135132522.

It is a happy number.

It is not a de Polignac number, because 225231531 - 2² = 225231527 is a prime.

It is a super-2 number, since 2×225231531² = 101458485113207922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (225231533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4266 + ... + 21648.

It is an arithmetic number, because the mean of its divisors is an integer number (21486624).

Almost surely, 2^225231531 is an apocalyptic number.

225231531 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

225231531 is a deficient number, since it is larger than the sum of its proper divisors (118554453).

225231531 is a wasteful number, since it uses less digits than its factorization.

225231531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18010.

The product of its digits is 1800, while the sum is 24.

The square root of 225231531 is about 15007.7157155911. The cubic root of 225231531 is about 608.4287529729.

Subtracting from 225231531 its reverse (135132522), we obtain a palindrome (90099009).

The spelling of 225231531 in words is "two hundred twenty-five million, two hundred thirty-one thousand, five hundred thirty-one".