16211791 has 4 divisors (see below), whose sum is σ = 16734784. Its totient is φ = 15688800.

The previous prime is 16211779. The next prime is 16211801. The reversal of 16211791 is 19711261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19711261 = 101 ⋅195161.

It is a cyclic number.

It is not a de Polignac number, because 16211791 - 2²³ = 7823183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16217791) 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, 261450 + ... + 261511.

It is an arithmetic number, because the mean of its divisors is an integer number (4183696).

Almost surely, 2^16211791 is an apocalyptic number.

16211791 is a deficient number, since it is larger than the sum of its proper divisors (522993).

16211791 is an equidigital number, since it uses as much as digits as its factorization.

16211791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522992.

The product of its digits is 756, while the sum is 28.

The square root of 16211791 is about 4026.3868418223. The cubic root of 16211791 is about 253.0911730644.

The spelling of 16211791 in words is "sixteen million, two hundred eleven thousand, seven hundred ninety-one".