16981189 has 8 divisors (see below), whose sum is σ = 17182080. Its totient is φ = 16781856.

The previous prime is 16981183. The next prime is 16981201. The reversal of 16981189 is 98118961.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 16981189 - 2⁵ = 16981157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16981183) 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, 54097 + ... + 54409.

It is an arithmetic number, because the mean of its divisors is an integer number (2147760).

Almost surely, 2^16981189 is an apocalyptic number.

It is an amenable number.

16981189 is a deficient number, since it is larger than the sum of its proper divisors (200891).

16981189 is a wasteful number, since it uses less digits than its factorization.

16981189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779.

The product of its digits is 31104, while the sum is 43.

The square root of 16981189 is about 4120.8238254019. The cubic root of 16981189 is about 257.0332841064.

It can be divided in two parts, 169 and 81189, that multiplied together give a triangular number (13720941 = T₅₂₃₈).

The spelling of 16981189 in words is "sixteen million, nine hundred eighty-one thousand, one hundred eighty-nine".