16904291 has 4 divisors (see below), whose sum is σ = 16992072. Its totient is φ = 16816512.

The previous prime is 16904263. The next prime is 16904309. The reversal of 16904291 is 19240961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19240961 = 53 ⋅363037.

It is a cyclic number.

It is not a de Polignac number, because 16904291 - 2¹⁰ = 16903267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16904201) 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, 43601 + ... + 43986.

It is an arithmetic number, because the mean of its divisors is an integer number (4248018).

Almost surely, 2^16904291 is an apocalyptic number.

16904291 is a deficient number, since it is larger than the sum of its proper divisors (87781).

16904291 is an equidigital number, since it uses as much as digits as its factorization.

16904291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87780.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 16904291 is about 4111.4828225350. The cubic root of 16904291 is about 256.6447118643.

The spelling of 16904291 in words is "sixteen million, nine hundred four thousand, two hundred ninety-one".