131321317 has 2 divisors, whose sum is σ = 131321318. Its totient is φ = 131321316.

The previous prime is 131321303. The next prime is 131321321. The reversal of 131321317 is 713123131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130850721 + 470596 = 11439^2 + 686^2 .

It is a cyclic number.

It is not a de Polignac number, because 131321317 - 2²³ = 122932709 is a prime.

It is a super-2 number, since 2×131321317² = 34490576597228978, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131321327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65660658 + 65660659.

It is an arithmetic number, because the mean of its divisors is an integer number (65660659).

Almost surely, 2^131321317 is an apocalyptic number.

It is an amenable number.

131321317 is a deficient number, since it is larger than the sum of its proper divisors (1).

131321317 is an equidigital number, since it uses as much as digits as its factorization.

131321317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378, while the sum is 22.

The square root of 131321317 is about 11459.5513437481. The cubic root of 131321317 is about 508.2902078856.

Adding to 131321317 its reverse (713123131), we get a palindrome (844444448).

The spelling of 131321317 in words is "one hundred thirty-one million, three hundred twenty-one thousand, three hundred seventeen".