12316981 has 4 divisors (see below), whose sum is σ = 12329632. Its totient is φ = 12304332.

The previous prime is 12316979. The next prime is 12316987. The reversal of 12316981 is 18961321.

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 12316981 - 2¹ = 12316979 is a prime.

It is a super-2 number, since 2×12316981² = 303416041908722, 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 (12316987) 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, 4731 + ... + 6856.

It is an arithmetic number, because the mean of its divisors is an integer number (3082408).

Almost surely, 2^12316981 is an apocalyptic number.

It is an amenable number.

12316981 is a deficient number, since it is larger than the sum of its proper divisors (12651).

12316981 is a wasteful number, since it uses less digits than its factorization.

12316981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12650.

The product of its digits is 2592, while the sum is 31.

The square root of 12316981 is about 3509.5556698819. Note that the first 3 decimals coincide. The cubic root of 12316981 is about 230.9412030287.

The spelling of 12316981 in words is "twelve million, three hundred sixteen thousand, nine hundred eighty-one".