131128397 has 2 divisors, whose sum is σ = 131128398. Its totient is φ = 131128396.

The previous prime is 131128379. The next prime is 131128411. The reversal of 131128397 is 793821131.

It is a happy number.

Together with previous prime (131128379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125865961 + 5262436 = 11219^2 + 2294^2 .

It is a cyclic number.

It is not a de Polignac number, because 131128397 - 2⁸ = 131128141 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131128337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65564198 + 65564199.

It is an arithmetic number, because the mean of its divisors is an integer number (65564199).

Almost surely, 2^131128397 is an apocalyptic number.

It is an amenable number.

131128397 is a deficient number, since it is larger than the sum of its proper divisors (1).

131128397 is an equidigital number, since it uses as much as digits as its factorization.

131128397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 35.

The square root of 131128397 is about 11451.1308175219. The cubic root of 131128397 is about 508.0411815355.

The spelling of 131128397 in words is "one hundred thirty-one million, one hundred twenty-eight thousand, three hundred ninety-seven".