16891145 has 4 divisors (see below), whose sum is σ = 20269380. Its totient is φ = 13512912.

The previous prime is 16891117. The next prime is 16891163. The reversal of 16891145 is 54119861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3728761 + 13162384 = 1931^2 + 3628^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16891145 is a prime.

It is a super-2 number, since 2×16891145² = 570621558822050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1689110 + ... + 1689119.

It is an arithmetic number, because the mean of its divisors is an integer number (5067345).

Almost surely, 2^16891145 is an apocalyptic number.

It is an amenable number.

16891145 is a deficient number, since it is larger than the sum of its proper divisors (3378235).

16891145 is an equidigital number, since it uses as much as digits as its factorization.

16891145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3378234.

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

The square root of 16891145 is about 4109.8838183092. The cubic root of 16891145 is about 256.5781661109.

The spelling of 16891145 in words is "sixteen million, eight hundred ninety-one thousand, one hundred forty-five".