440525521 has 4 divisors (see below), whose sum is σ = 440750772. Its totient is φ = 440300272.

The previous prime is 440525483. The next prime is 440525537. The reversal of 440525521 is 125525044.

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 202749121 + 237776400 = 14239^2 + 15420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-440525521 is a prime.

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 440525521.

It is not an unprimeable number, because it can be changed into a prime (440525321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109666 + ... + 113611.

It is an arithmetic number, because the mean of its divisors is an integer number (110187693).

Almost surely, 2^440525521 is an apocalyptic number.

It is an amenable number.

440525521 is a deficient number, since it is larger than the sum of its proper divisors (225251).

440525521 is a wasteful number, since it uses less digits than its factorization.

440525521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225250.

The product of its (nonzero) digits is 8000, while the sum is 28.

The square root of 440525521 is about 20988.6998406285. The cubic root of 440525521 is about 760.8931794626.

The spelling of 440525521 in words is "four hundred forty million, five hundred twenty-five thousand, five hundred twenty-one".