131421239 has 2 divisors, whose sum is σ = 131421240. Its totient is φ = 131421238.

The previous prime is 131421229. The next prime is 131421281. The reversal of 131421239 is 932124131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131421239 - 2⁸ = 131420983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131421229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65710619 + 65710620.

It is an arithmetic number, because the mean of its divisors is an integer number (65710620).

Almost surely, 2^131421239 is an apocalyptic number.

131421239 is a deficient number, since it is larger than the sum of its proper divisors (1).

131421239 is an equidigital number, since it uses as much as digits as its factorization.

131421239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 26.

The square root of 131421239 is about 11463.9102840174. The cubic root of 131421239 is about 508.4190940378.

The spelling of 131421239 in words is "one hundred thirty-one million, four hundred twenty-one thousand, two hundred thirty-nine".