24991457 has 4 divisors (see below), whose sum is σ = 25100820. Its totient is φ = 24882096.

The previous prime is 24991429. The next prime is 24991489. The reversal of 24991457 is 75419942.

24991457 is nontrivially palindromic in base 15.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19018321 + 5973136 = 4361^2 + 2444^2 .

It is a cyclic number.

It is not a de Polignac number, because 24991457 - 2¹⁶ = 24925921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (24991157) 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, 54338 + ... + 54795.

It is an arithmetic number, because the mean of its divisors is an integer number (6275205).

Almost surely, 2^24991457 is an apocalyptic number.

It is an amenable number.

24991457 is a deficient number, since it is larger than the sum of its proper divisors (109363).

24991457 is a wasteful number, since it uses less digits than its factorization.

24991457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109362.

The product of its digits is 90720, while the sum is 41.

The square root of 24991457 is about 4999.1456270047. The cubic root of 24991457 is about 292.3684635153.

The spelling of 24991457 in words is "twenty-four million, nine hundred ninety-one thousand, four hundred fifty-seven".