16991411 has 4 divisors (see below), whose sum is σ = 17730192. Its totient is φ = 16252632.

The previous prime is 16991389. The next prime is 16991423. The reversal of 16991411 is 11419961.

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

It is a cyclic number.

It is not a de Polignac number, because 16991411 - 2¹⁸ = 16729267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16991311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 369356 + ... + 369401.

It is an arithmetic number, because the mean of its divisors is an integer number (4432548).

Almost surely, 2^16991411 is an apocalyptic number.

16991411 is a deficient number, since it is larger than the sum of its proper divisors (738781).

16991411 is an equidigital number, since it uses as much as digits as its factorization.

16991411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738780.

The product of its digits is 1944, while the sum is 32.

The square root of 16991411 is about 4122.0639247833. The cubic root of 16991411 is about 257.0848483639.

The spelling of 16991411 in words is "sixteen million, nine hundred ninety-one thousand, four hundred eleven".