16990491 has 32 divisors (see below), whose sum is σ = 27970560. Its totient is φ = 8959104.

The previous prime is 16990489. The next prime is 16990507. The reversal of 16990491 is 19409961.

It is not a de Polignac number, because 16990491 - 2¹ = 16990489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16990411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13401 + ... + 14613.

It is an arithmetic number, because the mean of its divisors is an integer number (874080).

Almost surely, 2^16990491 is an apocalyptic number.

16990491 is a deficient number, since it is larger than the sum of its proper divisors (10980069).

16990491 is a wasteful number, since it uses less digits than its factorization.

16990491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 16990491 is about 4121.9523286909. The cubic root of 16990491 is about 257.0802083269.

The spelling of 16990491 in words is "sixteen million, nine hundred ninety thousand, four hundred ninety-one".