22778999 has 2 divisors, whose sum is σ = 22779000. Its totient is φ = 22778998.

The previous prime is 22778983. The next prime is 22779011. The reversal of 22778999 is 99987722.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22778999 - 2⁴ = 22778983 is a prime.

It is a Sophie Germain prime.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 22778999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22778969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11389499 + 11389500.

It is an arithmetic number, because the mean of its divisors is an integer number (11389500).

Almost surely, 2^22778999 is an apocalyptic number.

22778999 is a deficient number, since it is larger than the sum of its proper divisors (1).

22778999 is an equidigital number, since it uses as much as digits as its factorization.

22778999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 53.

The square root of 22778999 is about 4772.7349601670. The cubic root of 22778999 is about 283.4728990224.

The spelling of 22778999 in words is "twenty-two million, seven hundred seventy-eight thousand, nine hundred ninety-nine".