22273781 has 2 divisors, whose sum is σ = 22273782. Its totient is φ = 22273780.

The previous prime is 22273753. The next prime is 22273789. The reversal of 22273781 is 18737222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19280881 + 2992900 = 4391^2 + 1730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22273781 is a prime.

It is a super-2 number, since 2×22273781² = 992242640071922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22273789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11136890 + 11136891.

It is an arithmetic number, because the mean of its divisors is an integer number (11136891).

Almost surely, 2^22273781 is an apocalyptic number.

It is an amenable number.

22273781 is a deficient number, since it is larger than the sum of its proper divisors (1).

22273781 is an equidigital number, since it uses as much as digits as its factorization.

22273781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 32.

The square root of 22273781 is about 4719.5106737881. The cubic root of 22273781 is about 281.3614856127.

The spelling of 22273781 in words is "twenty-two million, two hundred seventy-three thousand, seven hundred eighty-one".