131207231 has 2 divisors, whose sum is σ = 131207232. Its totient is φ = 131207230.

The previous prime is 131207213. The next prime is 131207273. The reversal of 131207231 is 132702131.

Together with previous prime (131207213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131207231 is a prime.

It is a super-2 number, since 2×131207231² = 34430674933374722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131207731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65603615 + 65603616.

It is an arithmetic number, because the mean of its divisors is an integer number (65603616).

Almost surely, 2^131207231 is an apocalyptic number.

131207231 is a deficient number, since it is larger than the sum of its proper divisors (1).

131207231 is an equidigital number, since it uses as much as digits as its factorization.

131207231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 131207231 is about 11454.5724931138. The cubic root of 131207231 is about 508.1429720857.

Adding to 131207231 its reverse (132702131), we get a palindrome (263909362).

It can be divided in two parts, 13 and 1207231, that multiplied together give a triangular number (15694003 = T₅₆₀₂).

The spelling of 131207231 in words is "one hundred thirty-one million, two hundred seven thousand, two hundred thirty-one".