22491409 has 2 divisors, whose sum is σ = 22491410. Its totient is φ = 22491408.

The previous prime is 22491367. The next prime is 22491419. The reversal of 22491409 is 90419422.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20793600 + 1697809 = 4560^2 + 1303^2 .

It is a cyclic number.

It is not a de Polignac number, because 22491409 - 2¹⁵ = 22458641 is a prime.

It is not a weakly prime, because it can be changed into another prime (22491419) 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, 11245704 + 11245705.

It is an arithmetic number, because the mean of its divisors is an integer number (11245705).

Almost surely, 2^22491409 is an apocalyptic number.

It is an amenable number.

22491409 is a deficient number, since it is larger than the sum of its proper divisors (1).

22491409 is an equidigital number, since it uses as much as digits as its factorization.

22491409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 22491409 is about 4742.5108328817. The cubic root of 22491409 is about 282.2748732435.

The spelling of 22491409 in words is "twenty-two million, four hundred ninety-one thousand, four hundred nine".