521273287 has 4 divisors (see below), whose sum is σ = 532364256. Its totient is φ = 510182320.

The previous prime is 521273273. The next prime is 521273297. The reversal of 521273287 is 782372125.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 521273287 - 2¹¹ = 521271239 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 (521273237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5545414 + ... + 5545507.

It is an arithmetic number, because the mean of its divisors is an integer number (133091064).

Almost surely, 2^521273287 is an apocalyptic number.

521273287 is a deficient number, since it is larger than the sum of its proper divisors (11090969).

521273287 is a wasteful number, since it uses less digits than its factorization.

521273287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11090968.

The product of its digits is 47040, while the sum is 37.

The square root of 521273287 is about 22831.4100966191. The cubic root of 521273287 is about 804.8009677304.

The spelling of 521273287 in words is "five hundred twenty-one million, two hundred seventy-three thousand, two hundred eighty-seven".