521288953 has 4 divisors (see below), whose sum is σ = 521714340. Its totient is φ = 520863568.

The previous prime is 521288939. The next prime is 521288983. The reversal of 521288953 is 359882125.

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 479259664 + 42029289 = 21892^2 + 6483^2 .

It is a cyclic number.

It is not a de Polignac number, because 521288953 - 2¹³ = 521280761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521288983) 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 3 ways as a sum of consecutive naturals, for example, 210850 + ... + 213307.

It is an arithmetic number, because the mean of its divisors is an integer number (130428585).

Almost surely, 2^521288953 is an apocalyptic number.

It is an amenable number.

521288953 is a deficient number, since it is larger than the sum of its proper divisors (425387).

521288953 is a wasteful number, since it uses less digits than its factorization.

521288953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425386.

The product of its digits is 172800, while the sum is 43.

The square root of 521288953 is about 22831.7531740337. The cubic root of 521288953 is about 804.8090299669.

The spelling of 521288953 in words is "five hundred twenty-one million, two hundred eighty-eight thousand, nine hundred fifty-three".