22270991 has 2 divisors, whose sum is σ = 22270992. Its totient is φ = 22270990.

The previous prime is 22270987. The next prime is 22270993. The reversal of 22270991 is 19907222.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22270991 - 2² = 22270987 is a prime.

Together with 22270993, 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 (22270993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11135495 + 11135496.

It is an arithmetic number, because the mean of its divisors is an integer number (11135496).

Almost surely, 2^22270991 is an apocalyptic number.

22270991 is a deficient number, since it is larger than the sum of its proper divisors (1).

22270991 is an equidigital number, since it uses as much as digits as its factorization.

22270991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 22270991 is about 4719.2150830408. The cubic root of 22270991 is about 281.3497374004.

The spelling of 22270991 in words is "twenty-two million, two hundred seventy thousand, nine hundred ninety-one".