22618649 has 2 divisors, whose sum is σ = 22618650. Its totient is φ = 22618648.

The previous prime is 22618643. The next prime is 22618657. The reversal of 22618649 is 94681622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15366400 + 7252249 = 3920^2 + 2693^2 .

It is a cyclic number.

It is not a de Polignac number, because 22618649 - 2⁴ = 22618633 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (22618643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11309324 + 11309325.

It is an arithmetic number, because the mean of its divisors is an integer number (11309325).

Almost surely, 2^22618649 is an apocalyptic number.

It is an amenable number.

22618649 is a deficient number, since it is larger than the sum of its proper divisors (1).

22618649 is an equidigital number, since it uses as much as digits as its factorization.

22618649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 38.

The square root of 22618649 is about 4755.9067484550. The cubic root of 22618649 is about 282.8061744299.

The spelling of 22618649 in words is "twenty-two million, six hundred eighteen thousand, six hundred forty-nine".