22281977 has 2 divisors, whose sum is σ = 22281978. Its totient is φ = 22281976.

The previous prime is 22281943. The next prime is 22281979. The reversal of 22281977 is 77918222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21381376 + 900601 = 4624^2 + 949^2 .

It is a cyclic number.

It is not a de Polignac number, because 22281977 - 2¹⁰ = 22280953 is a prime.

Together with 22281979, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22281977.

It is not a weakly prime, because it can be changed into another prime (22281979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11140988 + 11140989.

It is an arithmetic number, because the mean of its divisors is an integer number (11140989).

Almost surely, 2^22281977 is an apocalyptic number.

It is an amenable number.

22281977 is a deficient number, since it is larger than the sum of its proper divisors (1).

22281977 is an equidigital number, since it uses as much as digits as its factorization.

22281977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 38.

The square root of 22281977 is about 4720.3789042830. The cubic root of 22281977 is about 281.3959918923.

The spelling of 22281977 in words is "twenty-two million, two hundred eighty-one thousand, nine hundred seventy-seven".