22056491 has 2 divisors, whose sum is σ = 22056492. Its totient is φ = 22056490.

The previous prime is 22056487. The next prime is 22056493. The reversal of 22056491 is 19465022.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22056491 - 2² = 22056487 is a prime.

It is a Sophie Germain prime.

Together with 22056493, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1392644 and since 22056491 and 1392644 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (22056493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11028245 + 11028246.

It is an arithmetic number, because the mean of its divisors is an integer number (11028246).

Almost surely, 2^22056491 is an apocalyptic number.

22056491 is a deficient number, since it is larger than the sum of its proper divisors (1).

22056491 is an equidigital number, since it uses as much as digits as its factorization.

22056491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 22056491 is about 4696.4338598558. The cubic root of 22056491 is about 280.4435614178.

The spelling of 22056491 in words is "twenty-two million, fifty-six thousand, four hundred ninety-one".