24997309 has 2 divisors, whose sum is σ = 24997310. Its totient is φ = 24997308.

The previous prime is 24997307. The next prime is 24997321. The reversal of 24997309 is 90379942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18896409 + 6100900 = 4347^2 + 2470^2 .

It is a cyclic number.

It is not a de Polignac number, because 24997309 - 2¹ = 24997307 is a prime.

Together with 24997307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24997307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12498654 + 12498655.

It is an arithmetic number, because the mean of its divisors is an integer number (12498655).

Almost surely, 2^24997309 is an apocalyptic number.

It is an amenable number.

24997309 is a deficient number, since it is larger than the sum of its proper divisors (1).

24997309 is an equidigital number, since it uses as much as digits as its factorization.

24997309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 24997309 is about 4999.7308927581. The cubic root of 24997309 is about 292.3912820692.

The spelling of 24997309 in words is "twenty-four million, nine hundred ninety-seven thousand, three hundred nine".