22071649 has 2 divisors, whose sum is σ = 22071650. Its totient is φ = 22071648.

The previous prime is 22071619. The next prime is 22071677. The reversal of 22071649 is 94617022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21455424 + 616225 = 4632^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 22071649 - 2⁵ = 22071617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22071649.

It is not a weakly prime, because it can be changed into another prime (22071619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11035824 + 11035825.

It is an arithmetic number, because the mean of its divisors is an integer number (11035825).

Almost surely, 2^22071649 is an apocalyptic number.

It is an amenable number.

22071649 is a deficient number, since it is larger than the sum of its proper divisors (1).

22071649 is an equidigital number, since it uses as much as digits as its factorization.

22071649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 22071649 is about 4698.0473603403. The cubic root of 22071649 is about 280.5077902817.

The spelling of 22071649 in words is "twenty-two million, seventy-one thousand, six hundred forty-nine".