22400491 has 2 divisors, whose sum is σ = 22400492. Its totient is φ = 22400490.

The previous prime is 22400479. The next prime is 22400513. The reversal of 22400491 is 19400422.

It is an a-pointer prime, because the next prime (22400513) can be obtained adding 22400491 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22400491 - 2¹³ = 22392299 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22400431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11200245 + 11200246.

It is an arithmetic number, because the mean of its divisors is an integer number (11200246).

Almost surely, 2^22400491 is an apocalyptic number.

22400491 is a deficient number, since it is larger than the sum of its proper divisors (1).

22400491 is an equidigital number, since it uses as much as digits as its factorization.

22400491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 22400491 is about 4732.9156975378. The cubic root of 22400491 is about 281.8940089245.

The spelling of 22400491 in words is "twenty-two million, four hundred thousand, four hundred ninety-one".