24999521 has 2 divisors, whose sum is σ = 24999522. Its totient is φ = 24999520.

The previous prime is 24999511. The next prime is 24999523. The reversal of 24999521 is 12599942.

24999521 = 3535² + 3536².

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., 12503296 + 12496225 = 3536^2 + 3535^2 .

It is a cyclic number.

It is not a de Polignac number, because 24999521 - 2¹⁰ = 24998497 is a prime.

Together with 24999523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (24999523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12499760 + 12499761.

It is an arithmetic number, because the mean of its divisors is an integer number (12499761).

Almost surely, 2^24999521 is an apocalyptic number.

24999521 is the 3536-th centered square number.

It is an amenable number.

24999521 is a deficient number, since it is larger than the sum of its proper divisors (1).

24999521 is an equidigital number, since it uses as much as digits as its factorization.

24999521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 41.

The square root of 24999521 is about 4999.9520997706. The cubic root of 24999521 is about 292.3999063367.

The spelling of 24999521 in words is "twenty-four million, nine hundred ninety-nine thousand, five hundred twenty-one".