16990591 has 2 divisors, whose sum is σ = 16990592. Its totient is φ = 16990590.

The previous prime is 16990577. The next prime is 16990601. The reversal of 16990591 is 19509961.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16990591 - 2⁵ = 16990559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16990091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8495295 + 8495296.

It is an arithmetic number, because the mean of its divisors is an integer number (8495296).

Almost surely, 2^16990591 is an apocalyptic number.

16990591 is a deficient number, since it is larger than the sum of its proper divisors (1).

16990591 is an equidigital number, since it uses as much as digits as its factorization.

16990591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 40.

The square root of 16990591 is about 4121.9644588473. The cubic root of 16990591 is about 257.0807126869.

The spelling of 16990591 in words is "sixteen million, nine hundred ninety thousand, five hundred ninety-one".