22143509 has 2 divisors, whose sum is σ = 22143510. Its totient is φ = 22143508.

The previous prime is 22143497. The next prime is 22143547. The reversal of 22143509 is 90534122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14799409 + 7344100 = 3847^2 + 2710^2 .

It is a cyclic number.

It is not a de Polignac number, because 22143509 - 2¹⁶ = 22077973 is a prime.

It is a zygodrome in base 3.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22143109) 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, 11071754 + 11071755.

It is an arithmetic number, because the mean of its divisors is an integer number (11071755).

Almost surely, 2^22143509 is an apocalyptic number.

It is an amenable number.

22143509 is a deficient number, since it is larger than the sum of its proper divisors (1).

22143509 is an equidigital number, since it uses as much as digits as its factorization.

22143509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 22143509 is about 4705.6890037485. The cubic root of 22143509 is about 280.8118825514.

The spelling of 22143509 in words is "twenty-two million, one hundred forty-three thousand, five hundred nine".