131406397 has 2 divisors, whose sum is σ = 131406398. Its totient is φ = 131406396.

The previous prime is 131406349. The next prime is 131406403. The reversal of 131406397 is 793604131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111746041 + 19660356 = 10571^2 + 4434^2 .

It is a cyclic number.

It is not a de Polignac number, because 131406397 - 2⁷ = 131406269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131400397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65703198 + 65703199.

It is an arithmetic number, because the mean of its divisors is an integer number (65703199).

Almost surely, 2^131406397 is an apocalyptic number.

It is an amenable number.

131406397 is a deficient number, since it is larger than the sum of its proper divisors (1).

131406397 is an equidigital number, since it uses as much as digits as its factorization.

131406397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 131406397 is about 11463.2629298991. The cubic root of 131406397 is about 508.3999539548.

The spelling of 131406397 in words is "one hundred thirty-one million, four hundred six thousand, three hundred ninety-seven".