131211031 has 8 divisors (see below), whose sum is σ = 150124320. Its totient is φ = 112339968.

The previous prime is 131211013. The next prime is 131211043. The reversal of 131211031 is 130112131.

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 131211031 - 2⁵ = 131210999 is a prime.

It is a super-2 number, since 2×131211031² = 34432669312165922, 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 (131212031) 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, 3586 + ... + 16591.

It is an arithmetic number, because the mean of its divisors is an integer number (18765540).

Almost surely, 2^131211031 is an apocalyptic number.

131211031 is a deficient number, since it is larger than the sum of its proper divisors (18913289).

131211031 is an equidigital number, since it uses as much as digits as its factorization.

131211031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21113.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 131211031 is about 11454.7383645372. The cubic root of 131211031 is about 508.1478776198.

Adding to 131211031 its reverse (130112131), we get a palindrome (261323162).

The spelling of 131211031 in words is "one hundred thirty-one million, two hundred eleven thousand, thirty-one".