22220791 has 2 divisors, whose sum is σ = 22220792. Its totient is φ = 22220790.

The previous prime is 22220777. The next prime is 22220813. The reversal of 22220791 is 19702222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22220791 - 2¹¹ = 22218743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22220741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110395 + 11110396.

It is an arithmetic number, because the mean of its divisors is an integer number (11110396).

Almost surely, 2^22220791 is an apocalyptic number.

22220791 is a deficient number, since it is larger than the sum of its proper divisors (1).

22220791 is an equidigital number, since it uses as much as digits as its factorization.

22220791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 22220791 is about 4713.8934014252. The cubic root of 22220791 is about 281.1381859398.

Subtracting from 22220791 its reverse (19702222), we obtain a square (2518569 = 1587²).

The spelling of 22220791 in words is "twenty-two million, two hundred twenty thousand, seven hundred ninety-one".