12731399 has 2 divisors, whose sum is σ = 12731400. Its totient is φ = 12731398.

The previous prime is 12731363. The next prime is 12731401. The reversal of 12731399 is 99313721.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12731399 is a prime.

It is a Sophie Germain prime.

Together with 12731401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12731339) 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, 6365699 + 6365700.

It is an arithmetic number, because the mean of its divisors is an integer number (6365700).

Almost surely, 2^12731399 is an apocalyptic number.

12731399 is a deficient number, since it is larger than the sum of its proper divisors (1).

12731399 is an equidigital number, since it uses as much as digits as its factorization.

12731399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 35.

The square root of 12731399 is about 3568.1086026073. The cubic root of 12731399 is about 233.5027732997.

The spelling of 12731399 in words is "twelve million, seven hundred thirty-one thousand, three hundred ninety-nine".