16910891 has 2 divisors, whose sum is σ = 16910892. Its totient is φ = 16910890.

The previous prime is 16910837. The next prime is 16910897. The reversal of 16910891 is 19801961.

It is a strong prime.

It is an emirp because it is prime and its reverse (19801961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16910891 - 2⁶ = 16910827 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (16910897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8455445 + 8455446.

It is an arithmetic number, because the mean of its divisors is an integer number (8455446).

Almost surely, 2^16910891 is an apocalyptic number.

16910891 is a deficient number, since it is larger than the sum of its proper divisors (1).

16910891 is an equidigital number, since it uses as much as digits as its factorization.

16910891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 16910891 is about 4112.2853743387. The cubic root of 16910891 is about 256.6781084084.

The spelling of 16910891 in words is "sixteen million, nine hundred ten thousand, eight hundred ninety-one".