521434303 has 24 divisors (see below), whose sum is σ = 585739728. Its totient is φ = 461362176.

The previous prime is 521434279. The next prime is 521434313. The reversal of 521434303 is 303434125.

It is not a de Polignac number, because 521434303 - 2¹³ = 521426111 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521434313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1476975 + ... + 1477327.

It is an arithmetic number, because the mean of its divisors is an integer number (24405822).

Almost surely, 2^521434303 is an apocalyptic number.

521434303 is a deficient number, since it is larger than the sum of its proper divisors (64305425).

521434303 is a wasteful number, since it uses less digits than its factorization.

521434303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 521434303 is about 22834.9360191790. The cubic root of 521434303 is about 804.8838241358.

Adding to 521434303 its reverse (303434125), we get a palindrome (824868428).

The spelling of 521434303 in words is "five hundred twenty-one million, four hundred thirty-four thousand, three hundred three".