22157789 has 2 divisors, whose sum is σ = 22157790. Its totient is φ = 22157788.

The previous prime is 22157767. The next prime is 22157797. The reversal of 22157789 is 98775122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18705625 + 3452164 = 4325^2 + 1858^2 .

It is a cyclic number.

It is not a de Polignac number, because 22157789 - 2¹² = 22153693 is a prime.

It is a super-2 number, since 2×22157789² = 981935226737042, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22157089) 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, 11078894 + 11078895.

It is an arithmetic number, because the mean of its divisors is an integer number (11078895).

Almost surely, 2^22157789 is an apocalyptic number.

It is an amenable number.

22157789 is a deficient number, since it is larger than the sum of its proper divisors (1).

22157789 is an equidigital number, since it uses as much as digits as its factorization.

22157789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 41.

The square root of 22157789 is about 4707.2060715461. The cubic root of 22157789 is about 280.8722332995.

The spelling of 22157789 in words is "twenty-two million, one hundred fifty-seven thousand, seven hundred eighty-nine".