12156981 has 16 divisors (see below), whose sum is σ = 16654464. Its totient is φ = 7884864.

The previous prime is 12156899. The next prime is 12156983. The reversal of 12156981 is 18965121.

It is not a de Polignac number, because 12156981 - 2¹³ = 12148789 is a prime.

It is a super-2 number, since 2×12156981² = 295584374068722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12156983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24720 + ... + 25206.

It is an arithmetic number, because the mean of its divisors is an integer number (1040904).

Almost surely, 2^12156981 is an apocalyptic number.

It is an amenable number.

12156981 is a deficient number, since it is larger than the sum of its proper divisors (4497483).

12156981 is a wasteful number, since it uses less digits than its factorization.

12156981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700.

The product of its digits is 4320, while the sum is 33.

The square root of 12156981 is about 3486.6862491483. The cubic root of 12156981 is about 229.9368509683.

The spelling of 12156981 in words is "twelve million, one hundred fifty-six thousand, nine hundred eighty-one".