131021239 has 2 divisors, whose sum is σ = 131021240. Its totient is φ = 131021238.

The previous prime is 131021167. The next prime is 131021249. The reversal of 131021239 is 932120131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131021239 - 2¹¹ = 131019191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131021249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65510619 + 65510620.

It is an arithmetic number, because the mean of its divisors is an integer number (65510620).

Almost surely, 2^131021239 is an apocalyptic number.

131021239 is a deficient number, since it is larger than the sum of its proper divisors (1).

131021239 is an equidigital number, since it uses as much as digits as its factorization.

131021239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 131021239 is about 11446.4509346784. The cubic root of 131021239 is about 507.9027535658.

It can be divided in two parts, 13102 and 1239, that added together give a palindrome (14341).

The spelling of 131021239 in words is "one hundred thirty-one million, twenty-one thousand, two hundred thirty-nine".