131231211 has 8 divisors (see below), whose sum is σ = 185267664. Its totient is φ = 82341120.

The previous prime is 131231207. The next prime is 131231213. The reversal of 131231211 is 112132131.

It is a happy number.

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

It is not a de Polignac number, because 131231211 - 2² = 131231207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131231213) 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, 1286530 + ... + 1286631.

It is an arithmetic number, because the mean of its divisors is an integer number (23158458).

Almost surely, 2^131231211 is an apocalyptic number.

131231211 is a deficient number, since it is larger than the sum of its proper divisors (54036453).

131231211 is a wasteful number, since it uses less digits than its factorization.

131231211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573181.

The product of its digits is 36, while the sum is 15.

The square root of 131231211 is about 11455.6191888523. The cubic root of 131231211 is about 508.1739270011.

Adding to 131231211 its reverse (112132131), we get a palindrome (243363342).

It can be divided in two parts, 1312 and 31211, that added together give a palindrome (32523).

The spelling of 131231211 in words is "one hundred thirty-one million, two hundred thirty-one thousand, two hundred eleven".