15966981 has 12 divisors (see below), whose sum is σ = 23554752. Its totient is φ = 10417896.

The previous prime is 15966967. The next prime is 15966983. The reversal of 15966981 is 18966951.

15966981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15966981 - 2⁵ = 15966949 is a prime.

It is a super-2 number, since 2×15966981² = 509888964508722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15966983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18451 + ... + 19296.

It is an arithmetic number, because the mean of its divisors is an integer number (1962896).

Almost surely, 2^15966981 is an apocalyptic number.

It is an amenable number.

15966981 is a deficient number, since it is larger than the sum of its proper divisors (7587771).

15966981 is a wasteful number, since it uses less digits than its factorization.

15966981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37800 (or 37797 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 15966981 is about 3995.8704933969. The cubic root of 15966981 is about 251.8107517149.

The spelling of 15966981 in words is "fifteen million, nine hundred sixty-six thousand, nine hundred eighty-one".