22149949 has 2 divisors, whose sum is σ = 22149950. Its totient is φ = 22149948.

The previous prime is 22149947. The next prime is 22149973. The reversal of 22149949 is 94994122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16892100 + 5257849 = 4110^2 + 2293^2 .

It is a cyclic number.

It is not a de Polignac number, because 22149949 - 2¹ = 22149947 is a prime.

Together with 22149947, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22149947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11074974 + 11074975.

It is an arithmetic number, because the mean of its divisors is an integer number (11074975).

Almost surely, 2^22149949 is an apocalyptic number.

It is an amenable number.

22149949 is a deficient number, since it is larger than the sum of its proper divisors (1).

22149949 is an equidigital number, since it uses as much as digits as its factorization.

22149949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 22149949 is about 4706.3732321183. The cubic root of 22149949 is about 280.8391027666.

The spelling of 22149949 in words is "twenty-two million, one hundred forty-nine thousand, nine hundred forty-nine".