22781669 has 2 divisors, whose sum is σ = 22781670. Its totient is φ = 22781668.

The previous prime is 22781663. The next prime is 22781713. The reversal of 22781669 is 96618722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15108769 + 7672900 = 3887^2 + 2770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22781669 is a prime.

It is a super-2 number, since 2×22781669² = 1038008884851122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22781663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11390834 + 11390835.

It is an arithmetic number, because the mean of its divisors is an integer number (11390835).

Almost surely, 2^22781669 is an apocalyptic number.

It is an amenable number.

22781669 is a deficient number, since it is larger than the sum of its proper divisors (1).

22781669 is an equidigital number, since it uses as much as digits as its factorization.

22781669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 41.

The square root of 22781669 is about 4773.0146658061. The cubic root of 22781669 is about 283.4839741809.

The spelling of 22781669 in words is "twenty-two million, seven hundred eighty-one thousand, six hundred sixty-nine".