24991009 has 2 divisors, whose sum is σ = 24991010. Its totient is φ = 24991008.

The previous prime is 24990989. The next prime is 24991019. The reversal of 24991009 is 90019942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22278400 + 2712609 = 4720^2 + 1647^2 .

It is a cyclic number.

It is not a de Polignac number, because 24991009 - 2¹¹ = 24988961 is a prime.

It is not a weakly prime, because it can be changed into another prime (24991019) 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, 12495504 + 12495505.

It is an arithmetic number, because the mean of its divisors is an integer number (12495505).

Almost surely, 2^24991009 is an apocalyptic number.

It is an amenable number.

24991009 is a deficient number, since it is larger than the sum of its proper divisors (1).

24991009 is an equidigital number, since it uses as much as digits as its factorization.

24991009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 24991009 is about 4999.1008191474. The cubic root of 24991009 is about 292.3667164936.

The spelling of 24991009 in words is "twenty-four million, nine hundred ninety-one thousand, nine".