13231997 has 2 divisors, whose sum is σ = 13231998. Its totient is φ = 13231996.

The previous prime is 13231991. The next prime is 13232017. The reversal of 13231997 is 79913231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11930116 + 1301881 = 3454^2 + 1141^2 .

It is a cyclic number.

It is not a de Polignac number, because 13231997 - 2⁸ = 13231741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13231991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6615998 + 6615999.

It is an arithmetic number, because the mean of its divisors is an integer number (6615999).

Almost surely, 2^13231997 is an apocalyptic number.

It is an amenable number.

13231997 is a deficient number, since it is larger than the sum of its proper divisors (1).

13231997 is an equidigital number, since it uses as much as digits as its factorization.

13231997 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 13231997 is about 3637.5812018428. The cubic root of 13231997 is about 236.5239543845.

The spelling of 13231997 in words is "thirteen million, two hundred thirty-one thousand, nine hundred ninety-seven".