12997281 has 8 divisors (see below), whose sum is σ = 18905184. Its totient is φ = 7877120.

The previous prime is 12997279. The next prime is 12997289. The reversal of 12997281 is 18279921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12997281 - 2¹ = 12997279 is a prime.

It is a super-2 number, since 2×12997281² = 337858626785922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12997289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196896 + ... + 196961.

It is an arithmetic number, because the mean of its divisors is an integer number (2363148).

Almost surely, 2^12997281 is an apocalyptic number.

12997281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12997281 is a deficient number, since it is larger than the sum of its proper divisors (5907903).

12997281 is a wasteful number, since it uses less digits than its factorization.

12997281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393871.

The product of its digits is 18144, while the sum is 39.

The square root of 12997281 is about 3605.1741982878. The cubic root of 12997281 is about 235.1170746059.

The spelling of 12997281 in words is "twelve million, nine hundred ninety-seven thousand, two hundred eighty-one".