22266781 has 2 divisors, whose sum is σ = 22266782. Its totient is φ = 22266780.

The previous prime is 22266757. The next prime is 22266793. The reversal of 22266781 is 18766222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18844281 + 3422500 = 4341^2 + 1850^2 .

It is a cyclic number.

It is not a de Polignac number, because 22266781 - 2⁷ = 22266653 is a prime.

It is a super-2 number, since 2×22266781² = 991619072203922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22260781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11133390 + 11133391.

It is an arithmetic number, because the mean of its divisors is an integer number (11133391).

Almost surely, 2^22266781 is an apocalyptic number.

It is an amenable number.

22266781 is a deficient number, since it is larger than the sum of its proper divisors (1).

22266781 is an equidigital number, since it uses as much as digits as its factorization.

22266781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 34.

The square root of 22266781 is about 4718.7690132067. The cubic root of 22266781 is about 281.3320079538.

The spelling of 22266781 in words is "twenty-two million, two hundred sixty-six thousand, seven hundred eighty-one".