22143491 has 2 divisors, whose sum is σ = 22143492. Its totient is φ = 22143490.

The previous prime is 22143461. The next prime is 22143497. The reversal of 22143491 is 19434122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22143491 - 2¹⁴ = 22127107 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22143491.

It is not a weakly prime, because it can be changed into another prime (22143497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11071745 + 11071746.

It is an arithmetic number, because the mean of its divisors is an integer number (11071746).

Almost surely, 2^22143491 is an apocalyptic number.

22143491 is a deficient number, since it is larger than the sum of its proper divisors (1).

22143491 is an equidigital number, since it uses as much as digits as its factorization.

22143491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 22143491 is about 4705.6870911696. The cubic root of 22143491 is about 280.8118064627.

The spelling of 22143491 in words is "twenty-two million, one hundred forty-three thousand, four hundred ninety-one".