16422591 has 32 divisors (see below), whose sum is σ = 23869440. Its totient is φ = 10022400.

The previous prime is 16422587. The next prime is 16422607. The reversal of 16422591 is 19522461.

It is not a de Polignac number, because 16422591 - 2² = 16422587 is a prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16422521) 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 31 ways as a sum of consecutive naturals, for example, 224931 + ... + 225003.

It is an arithmetic number, because the mean of its divisors is an integer number (745920).

Almost surely, 2^16422591 is an apocalyptic number.

16422591 is a deficient number, since it is larger than the sum of its proper divisors (7446849).

16422591 is a wasteful number, since it uses less digits than its factorization.

16422591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207.

The product of its digits is 4320, while the sum is 30.

The square root of 16422591 is about 4052.4796112997. The cubic root of 16422591 is about 254.1834240437.

The spelling of 16422591 in words is "sixteen million, four hundred twenty-two thousand, five hundred ninety-one".