24725521 has 4 divisors (see below), whose sum is σ = 24834672. Its totient is φ = 24616372.

The previous prime is 24725513. The next prime is 24725527. The reversal of 24725521 is 12552742.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12552742 = 2 ⋅6276371.

It is a cyclic number.

It is not a de Polignac number, because 24725521 - 2³ = 24725513 is a prime.

It is a super-2 number, since 2×24725521² = 1222702777442882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 24725521.

It is not an unprimeable number, because it can be changed into a prime (24725527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54235 + ... + 54688.

It is an arithmetic number, because the mean of its divisors is an integer number (6208668).

Almost surely, 2^24725521 is an apocalyptic number.

It is an amenable number.

24725521 is a deficient number, since it is larger than the sum of its proper divisors (109151).

24725521 is a wasteful number, since it uses less digits than its factorization.

24725521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109150.

The product of its digits is 5600, while the sum is 28.

The square root of 24725521 is about 4972.4763448407. The cubic root of 24725521 is about 291.3277248398.

The spelling of 24725521 in words is "twenty-four million, seven hundred twenty-five thousand, five hundred twenty-one".