520087391 has 8 divisors (see below), whose sum is σ = 524601168. Its totient is φ = 515592000.

The previous prime is 520087349. The next prime is 520087397. The reversal of 520087391 is 193780025.

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

It is a cyclic number.

It is not a de Polignac number, because 520087391 - 2⁶ = 520087327 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 (520087397) 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, 55571 + ... + 64251.

It is an arithmetic number, because the mean of its divisors is an integer number (65575146).

Almost surely, 2^520087391 is an apocalyptic number.

520087391 is a deficient number, since it is larger than the sum of its proper divisors (4513777).

520087391 is a wasteful number, since it uses less digits than its factorization.

520087391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9193.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 520087391 is about 22805.4245959158. The cubic root of 520087391 is about 804.1901973028.

The spelling of 520087391 in words is "five hundred twenty million, eighty-seven thousand, three hundred ninety-one".