131281399 has 2 divisors, whose sum is σ = 131281400. Its totient is φ = 131281398.

The previous prime is 131281369. The next prime is 131281421. The reversal of 131281399 is 993182131.

It is a strong prime.

It is an emirp because it is prime and its reverse (993182131) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131281399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131281369) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65640699 + 65640700.

It is an arithmetic number, because the mean of its divisors is an integer number (65640700).

Almost surely, 2^131281399 is an apocalyptic number.

131281399 is a deficient number, since it is larger than the sum of its proper divisors (1).

131281399 is an equidigital number, since it uses as much as digits as its factorization.

131281399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 37.

The square root of 131281399 is about 11457.8095201483. The cubic root of 131281399 is about 508.2387006736.

The spelling of 131281399 in words is "one hundred thirty-one million, two hundred eighty-one thousand, three hundred ninety-nine".