12797981 has 4 divisors (see below), whose sum is σ = 14626272. Its totient is φ = 10969692.

The previous prime is 12797971. The next prime is 12797987. The reversal of 12797981 is 18979721.

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.

It is a cyclic number.

It is not a de Polignac number, because 12797981 - 2¹⁰ = 12796957 is a prime.

It is a super-2 number, since 2×12797981² = 327576635352722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12797987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 914135 + ... + 914148.

It is an arithmetic number, because the mean of its divisors is an integer number (3656568).

Almost surely, 2^12797981 is an apocalyptic number.

It is an amenable number.

12797981 is a deficient number, since it is larger than the sum of its proper divisors (1828291).

12797981 is an equidigital number, since it uses as much as digits as its factorization.

12797981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828290.

The product of its digits is 63504, while the sum is 44.

The square root of 12797981 is about 3577.4265890441. The cubic root of 12797981 is about 233.9091192607.

The spelling of 12797981 in words is "twelve million, seven hundred ninety-seven thousand, nine hundred eighty-one".