13581397 has 2 divisors, whose sum is σ = 13581398. Its totient is φ = 13581396.

The previous prime is 13581389. The next prime is 13581413. The reversal of 13581397 is 79318531.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13024881 + 556516 = 3609^2 + 746^2 .

It is a cyclic number.

It is not a de Polignac number, because 13581397 - 2³ = 13581389 is a prime.

It is equal to p₈₈₄₅₆₆ and since 13581397 and 884566 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13581307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6790698 + 6790699.

It is an arithmetic number, because the mean of its divisors is an integer number (6790699).

Almost surely, 2^13581397 is an apocalyptic number.

It is an amenable number.

13581397 is a deficient number, since it is larger than the sum of its proper divisors (1).

13581397 is an equidigital number, since it uses as much as digits as its factorization.

13581397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 37.

The square root of 13581397 is about 3685.2946964931. The cubic root of 13581397 is about 238.5877535873.

The spelling of 13581397 in words is "thirteen million, five hundred eighty-one thousand, three hundred ninety-seven".