16164981 has 48 divisors (see below), whose sum is σ = 28598400. Its totient is φ = 8838720.

The previous prime is 16164979. The next prime is 16164983. The reversal of 16164981 is 18946161.

It is a happy number.

16164981 is a `hidden beast` number, since 1 + 6 + 1 + 649 + 8 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (16164979) and next prime (16164983).

It is not a de Polignac number, because 16164981 - 2¹ = 16164979 is a prime.

It is a super-2 number, since 2×16164981² = 522613221460722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16164983) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 181585 + ... + 181673.

It is an arithmetic number, because the mean of its divisors is an integer number (595800).

Almost surely, 2^16164981 is an apocalyptic number.

It is an amenable number.

16164981 is a deficient number, since it is larger than the sum of its proper divisors (12433419).

16164981 is an equidigital number, since it uses as much as digits as its factorization.

16164981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 130 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 16164981 is about 4020.5697357464. The cubic root of 16164981 is about 252.8473460316.

The spelling of 16164981 in words is "sixteen million, one hundred sixty-four thousand, nine hundred eighty-one".