24961009 has 2 divisors, whose sum is σ = 24961010. Its totient is φ = 24961008.

The previous prime is 24961007. The next prime is 24961019. The reversal of 24961009 is 90016942.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24039409 + 921600 = 4903^2 + 960^2 .

It is a cyclic number.

It is not a de Polignac number, because 24961009 - 2¹ = 24961007 is a prime.

Together with 24961007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (24961007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12480504 + 12480505.

It is an arithmetic number, because the mean of its divisors is an integer number (12480505).

Almost surely, 2^24961009 is an apocalyptic number.

It is an amenable number.

24961009 is a deficient number, since it is larger than the sum of its proper divisors (1).

24961009 is an equidigital number, since it uses as much as digits as its factorization.

24961009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 24961009 is about 4996.0993785152. The cubic root of 24961009 is about 292.2496808896.

The spelling of 24961009 in words is "twenty-four million, nine hundred sixty-one thousand, nine".