16217091 has 24 divisors (see below), whose sum is σ = 26505024. Its totient is φ = 9826920.

The previous prime is 16217087. The next prime is 16217141. The reversal of 16217091 is 19071261.

It is not a de Polignac number, because 16217091 - 2² = 16217087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (16217081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 361 + ... + 5706.

It is an arithmetic number, because the mean of its divisors is an integer number (1104376).

Almost surely, 2^16217091 is an apocalyptic number.

16217091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16217091 is a deficient number, since it is larger than the sum of its proper divisors (10287933).

16217091 is an equidigital number, since it uses as much as digits as its factorization.

16217091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6093 (or 6081 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 16217091 is about 4027.0449463596. The cubic root of 16217091 is about 253.1187504630.

It can be divided in two parts, 162170 and 91, that added together give a palindrome (162261).

The spelling of 16217091 in words is "sixteen million, two hundred seventeen thousand, ninety-one".