521304987 has 8 divisors (see below), whose sum is σ = 794369536. Its totient is φ = 297888552.

The previous prime is 521304967. The next prime is 521304991. The reversal of 521304987 is 789403125.

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

It is not a de Polignac number, because 521304987 - 2¹¹ = 521302939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521304907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12412003 + ... + 12412044.

It is an arithmetic number, because the mean of its divisors is an integer number (99296192).

Almost surely, 2^521304987 is an apocalyptic number.

521304987 is a deficient number, since it is larger than the sum of its proper divisors (273064549).

521304987 is a wasteful number, since it uses less digits than its factorization.

521304987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24824057.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 521304987 is about 22832.1043051226. The cubic root of 521304987 is about 804.8172814211.

The spelling of 521304987 in words is "five hundred twenty-one million, three hundred four thousand, nine hundred eighty-seven".