12231131 has 4 divisors (see below), whose sum is σ = 13343064. Its totient is φ = 11119200.

The previous prime is 12231083. The next prime is 12231133. The reversal of 12231131 is 13113221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12231131 - 2¹⁰ = 12230107 is a prime.

It is a super-2 number, since 2×12231131² = 299201131078322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12231133) 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, 555950 + ... + 555971.

It is an arithmetic number, because the mean of its divisors is an integer number (3335766).

Almost surely, 2^12231131 is an apocalyptic number.

12231131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12231131 is a deficient number, since it is larger than the sum of its proper divisors (1111933).

12231131 is a wasteful number, since it uses less digits than its factorization.

12231131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111932.

The product of its digits is 36, while the sum is 14.

The square root of 12231131 is about 3497.3033897562. The cubic root of 12231131 is about 230.4033941577.

Adding to 12231131 its reverse (13113221), we get a palindrome (25344352).

The spelling of 12231131 in words is "twelve million, two hundred thirty-one thousand, one hundred thirty-one".