22149891 has 6 divisors (see below), whose sum is σ = 31994300. Its totient is φ = 14766588.

The previous prime is 22149889. The next prime is 22149899. The reversal of 22149891 is 19894122.

It is not a de Polignac number, because 22149891 - 2¹ = 22149889 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (22149899) 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 5 ways as a sum of consecutive naturals, for example, 1230541 + ... + 1230558.

Almost surely, 2^22149891 is an apocalyptic number.

22149891 is a deficient number, since it is larger than the sum of its proper divisors (9844409).

22149891 is a wasteful number, since it uses less digits than its factorization.

22149891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2461105 (or 2461102 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 22149891 is about 4706.3670702571. The cubic root of 22149891 is about 280.8388576391.

The spelling of 22149891 in words is "twenty-two million, one hundred forty-nine thousand, eight hundred ninety-one".