131231011 has 4 divisors (see below), whose sum is σ = 131331232. Its totient is φ = 131130792.

The previous prime is 131230999. The next prime is 131231027. The reversal of 131231011 is 110132131.

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 131231011 - 2⁹ = 131230499 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131230982 and 131231000.

It is not an unprimeable number, because it can be changed into a prime (131231071) 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, 48120 + ... + 50773.

It is an arithmetic number, because the mean of its divisors is an integer number (32832808).

Almost surely, 2^131231011 is an apocalyptic number.

131231011 is a deficient number, since it is larger than the sum of its proper divisors (100221).

131231011 is an equidigital number, since it uses as much as digits as its factorization.

131231011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100220.

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

The square root of 131231011 is about 11455.6104595085. The cubic root of 131231011 is about 508.1736688439.

Adding to 131231011 its reverse (110132131), we get a palindrome (241363142).

It can be divided in two parts, 1312 and 31011, that added together give a palindrome (32323).

The spelling of 131231011 in words is "one hundred thirty-one million, two hundred thirty-one thousand, eleven".