13281997 has 4 divisors (see below), whose sum is σ = 13340736. Its totient is φ = 13223260.

The previous prime is 13281973. The next prime is 13282019. The reversal of 13281997 is 79918231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79918231 = 2203 ⋅36277.

It is a cyclic number.

It is not a de Polignac number, because 13281997 - 2¹¹ = 13279949 is a prime.

It is a super-2 number, since 2×13281997² = 352822888616018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13281967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29029 + ... + 29482.

It is an arithmetic number, because the mean of its divisors is an integer number (3335184).

Almost surely, 2^13281997 is an apocalyptic number.

It is an amenable number.

13281997 is a deficient number, since it is larger than the sum of its proper divisors (58739).

13281997 is an equidigital number, since it uses as much as digits as its factorization.

13281997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58738.

The product of its digits is 27216, while the sum is 40.

The square root of 13281997 is about 3644.4474203917. The cubic root of 13281997 is about 236.8214991152.

The spelling of 13281997 in words is "thirteen million, two hundred eighty-one thousand, nine hundred ninety-seven".