16945181 has 8 divisors (see below), whose sum is σ = 19289664. Its totient is φ = 14734720.

The previous prime is 16945163. The next prime is 16945211. The reversal of 16945181 is 18154961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16945181 - 2¹⁴ = 16928797 is a prime.

It is a super-2 number, since 2×16945181² = 574278318245522, 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 (16945121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33236 + ... + 33741.

It is an arithmetic number, because the mean of its divisors is an integer number (2411208).

Almost surely, 2^16945181 is an apocalyptic number.

16945181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16945181 is a deficient number, since it is larger than the sum of its proper divisors (2344483).

16945181 is a wasteful number, since it uses less digits than its factorization.

16945181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67011.

The product of its digits is 8640, while the sum is 35.

The square root of 16945181 is about 4116.4524775588. The cubic root of 16945181 is about 256.8514789332.

The spelling of 16945181 in words is "sixteen million, nine hundred forty-five thousand, one hundred eighty-one".