131212231 has 8 divisors (see below), whose sum is σ = 133416000. Its totient is φ = 129026400.

The previous prime is 131212223. The next prime is 131212253. The reversal of 131212231 is 132212131.

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

It is a cyclic number.

It is not a de Polignac number, because 131212231 - 2³ = 131212223 is a prime.

It is a super-2 number, since 2×131212231² = 34433299127994722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131212261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10690 + ... + 19408.

It is an arithmetic number, because the mean of its divisors is an integer number (16677000).

Almost surely, 2^131212231 is an apocalyptic number.

131212231 is a deficient number, since it is larger than the sum of its proper divisors (2203769).

131212231 is a wasteful number, since it uses less digits than its factorization.

131212231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8969.

The product of its digits is 72, while the sum is 16.

The square root of 131212231 is about 11454.7907444877. The cubic root of 131212231 is about 508.1494267162.

Adding to 131212231 its reverse (132212131), we get a palindrome (263424362).

The spelling of 131212231 in words is "one hundred thirty-one million, two hundred twelve thousand, two hundred thirty-one".