16222591 has 24 divisors (see below), whose sum is σ = 20684160. Its totient is φ = 12452880.

The previous prime is 16222553. The next prime is 16222631. The reversal of 16222591 is 19522261.

It is not a de Polignac number, because 16222591 - 2¹⁷ = 16091519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16222541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90540 + ... + 90718.

It is an arithmetic number, because the mean of its divisors is an integer number (861840).

Almost surely, 2^16222591 is an apocalyptic number.

16222591 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16222591 is a deficient number, since it is larger than the sum of its proper divisors (4461569).

16222591 is a wasteful number, since it uses less digits than its factorization.

16222591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 304 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 16222591 is about 4027.7277713371. The cubic root of 16222591 is about 253.1473621660.

The spelling of 16222591 in words is "sixteen million, two hundred twenty-two thousand, five hundred ninety-one".