22150661 has 12 divisors (see below), whose sum is σ = 24448068. Its totient is φ = 20052864.

The previous prime is 22150591. The next prime is 22150691. The reversal of 22150661 is 16605122.

It can be written as a sum of positive squares in 6 ways, for example, as 481636 + 21669025 = 694^2 + 4655^2 .

It is not a de Polignac number, because 22150661 - 2¹⁰ = 22149637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22150691) 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 11 ways as a sum of consecutive naturals, for example, 7721 + ... + 10193.

It is an arithmetic number, because the mean of its divisors is an integer number (2037339).

Almost surely, 2^22150661 is an apocalyptic number.

It is an amenable number.

22150661 is a deficient number, since it is larger than the sum of its proper divisors (2297407).

22150661 is a wasteful number, since it uses less digits than its factorization.

22150661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2552 (or 2539 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 22150661 is about 4706.4488736201. The cubic root of 22150661 is about 280.8421118826.

Adding to 22150661 its reverse (16605122), we get a palindrome (38755783).

The spelling of 22150661 in words is "twenty-two million, one hundred fifty thousand, six hundred sixty-one".