521275913 has 8 divisors (see below), whose sum is σ = 552142080. Its totient is φ = 490432320.

The previous prime is 521275903. The next prime is 521275999. The reversal of 521275913 is 319572125.

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

It is a de Polignac number, because none of the positive numbers 2^k-521275913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521275903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74708 + ... + 81386.

It is an arithmetic number, because the mean of its divisors is an integer number (69017760).

Almost surely, 2^521275913 is an apocalyptic number.

It is an amenable number.

521275913 is a deficient number, since it is larger than the sum of its proper divisors (30866167).

521275913 is a wasteful number, since it uses less digits than its factorization.

521275913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11287.

The product of its digits is 18900, while the sum is 35.

The square root of 521275913 is about 22831.4676050402. The cubic root of 521275913 is about 804.8023191672.

The spelling of 521275913 in words is "five hundred twenty-one million, two hundred seventy-five thousand, nine hundred thirteen".