22231945 has 4 divisors (see below), whose sum is σ = 26678340. Its totient is φ = 17785552.

The previous prime is 22231939. The next prime is 22231973. The reversal of 22231945 is 54913222.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6574096 + 15657849 = 2564^2 + 3957^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22231945 is a prime.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2223190 + ... + 2223199.

It is an arithmetic number, because the mean of its divisors is an integer number (6669585).

Almost surely, 2^22231945 is an apocalyptic number.

It is an amenable number.

22231945 is a deficient number, since it is larger than the sum of its proper divisors (4446395).

22231945 is an equidigital number, since it uses as much as digits as its factorization.

22231945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4446394.

The product of its digits is 4320, while the sum is 28.

The square root of 22231945 is about 4715.0763514497. The cubic root of 22231945 is about 281.1852183307.

The spelling of 22231945 in words is "twenty-two million, two hundred thirty-one thousand, nine hundred forty-five".