131281613 has 2 divisors, whose sum is σ = 131281614. Its totient is φ = 131281612.

The previous prime is 131281607. The next prime is 131281679. The reversal of 131281613 is 316182131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108222409 + 23059204 = 10403^2 + 4802^2 .

It is a cyclic number.

It is not a de Polignac number, because 131281613 - 2⁴ = 131281597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131281603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65640806 + 65640807.

It is an arithmetic number, because the mean of its divisors is an integer number (65640807).

Almost surely, 2^131281613 is an apocalyptic number.

It is an amenable number.

131281613 is a deficient number, since it is larger than the sum of its proper divisors (1).

131281613 is an equidigital number, since it uses as much as digits as its factorization.

131281613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 131281613 is about 11457.8188587532. The cubic root of 131281613 is about 508.2389768311.

It can be divided in two parts, 13128 and 1613, that added together give a palindrome (14741).

The spelling of 131281613 in words is "one hundred thirty-one million, two hundred eighty-one thousand, six hundred thirteen".