520836861 has 4 divisors (see below), whose sum is σ = 694449152. Its totient is φ = 347224572.

The previous prime is 520836853. The next prime is 520836881. The reversal of 520836861 is 168638025.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 520836861 - 2³ = 520836853 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 (520836821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86806141 + ... + 86806146.

It is an arithmetic number, because the mean of its divisors is an integer number (173612288).

Almost surely, 2^520836861 is an apocalyptic number.

It is an amenable number.

520836861 is a deficient number, since it is larger than the sum of its proper divisors (173612291).

520836861 is a wasteful number, since it uses less digits than its factorization.

520836861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173612290.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 520836861 is about 22821.8505165554. The cubic root of 520836861 is about 804.5763036604.

The spelling of 520836861 in words is "five hundred twenty million, eight hundred thirty-six thousand, eight hundred sixty-one".