525440621 has 8 divisors (see below), whose sum is σ = 533975544. Its totient is φ = 516974080.

The previous prime is 525440579. The next prime is 525440623. The reversal of 525440621 is 126044525.

It can be written as a sum of positive squares in 4 ways, for example, as 6056521 + 519384100 = 2461^2 + 22790^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 525440621 - 2⁶ = 525440557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525440623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1490 + ... + 32451.

It is an arithmetic number, because the mean of its divisors is an integer number (66746943).

Almost surely, 2^525440621 is an apocalyptic number.

It is an amenable number.

525440621 is a deficient number, since it is larger than the sum of its proper divisors (8534923).

525440621 is a wasteful number, since it uses less digits than its factorization.

525440621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34191.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 525440621 is about 22922.4915966829. The cubic root of 525440621 is about 806.9399457908.

The spelling of 525440621 in words is "five hundred twenty-five million, four hundred forty thousand, six hundred twenty-one".