520801387 has 4 divisors (see below), whose sum is σ = 520858096. Its totient is φ = 520744680.

The previous prime is 520801361. The next prime is 520801403. The reversal of 520801387 is 783108025.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520801387 is a prime.

It is a super-2 number, since 2×520801387² = 542468169402247538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520811387) 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, 11064 + ... + 34117.

It is an arithmetic number, because the mean of its divisors is an integer number (130214524).

Almost surely, 2^520801387 is an apocalyptic number.

520801387 is a deficient number, since it is larger than the sum of its proper divisors (56709).

520801387 is a wasteful number, since it uses less digits than its factorization.

520801387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56708.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 520801387 is about 22821.0733095532. The cubic root of 520801387 is about 804.5580367840.

The spelling of 520801387 in words is "five hundred twenty million, eight hundred one thousand, three hundred eighty-seven".