12231531 has 12 divisors (see below), whose sum is σ = 19027008. Its totient is φ = 7527024.

The previous prime is 12231523. The next prime is 12231539. The reversal of 12231531 is 13513221.

It is an interprime number because it is at equal distance from previous prime (12231523) and next prime (12231539).

It is not a de Polignac number, because 12231531 - 2³ = 12231523 is a prime.

It is a super-2 number, since 2×12231531² = 299220701207922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12231539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52155 + ... + 52388.

It is an arithmetic number, because the mean of its divisors is an integer number (1585584).

Almost surely, 2^12231531 is an apocalyptic number.

12231531 is a deficient number, since it is larger than the sum of its proper divisors (6795477).

12231531 is a wasteful number, since it uses less digits than its factorization.

12231531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104562 (or 104559 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 12231531 is about 3497.3605762060. The cubic root of 12231531 is about 230.4059057912.

Adding to 12231531 its reverse (13513221), we get a palindrome (25744752).

The spelling of 12231531 in words is "twelve million, two hundred thirty-one thousand, five hundred thirty-one".