22251091 has 4 divisors (see below), whose sum is σ = 23018400. Its totient is φ = 21483784.

The previous prime is 22251077. The next prime is 22251101. The reversal of 22251091 is 19015222.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22251091 - 2¹¹ = 22249043 is a prime.

It is a super-2 number, since 2×22251091² = 990222101380562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22251041) 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, 383611 + ... + 383668.

It is an arithmetic number, because the mean of its divisors is an integer number (5754600).

Almost surely, 2^22251091 is an apocalyptic number.

22251091 is a deficient number, since it is larger than the sum of its proper divisors (767309).

22251091 is an equidigital number, since it uses as much as digits as its factorization.

22251091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767308.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 22251091 is about 4717.1062103794. The cubic root of 22251091 is about 281.2659134370.

The spelling of 22251091 in words is "twenty-two million, two hundred fifty-one thousand, ninety-one".