22251891 has 16 divisors (see below), whose sum is σ = 30391200. Its totient is φ = 14476800.

The previous prime is 22251881. The next prime is 22251899. The reversal of 22251891 is 19815222.

It is a de Polignac number, because none of the positive numbers 2^k-22251891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22251899) 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 15 ways as a sum of consecutive naturals, for example, 55291 + ... + 55691.

It is an arithmetic number, because the mean of its divisors is an integer number (1899450).

Almost surely, 2^22251891 is an apocalyptic number.

22251891 is a deficient number, since it is larger than the sum of its proper divisors (8139309).

22251891 is a wasteful number, since it uses less digits than its factorization.

22251891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806.

The product of its digits is 2880, while the sum is 30.

The square root of 22251891 is about 4717.1910073687. The cubic root of 22251891 is about 281.2692842086.

The spelling of 22251891 in words is "twenty-two million, two hundred fifty-one thousand, eight hundred ninety-one".