520156849 has 4 divisors (see below), whose sum is σ = 531224064. Its totient is φ = 509089636.

The previous prime is 520156831. The next prime is 520156877. The reversal of 520156849 is 948651025.

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 a cyclic number.

It is not a de Polignac number, because 520156849 - 2¹¹ = 520154801 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520156649) 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, 5533537 + ... + 5533630.

It is an arithmetic number, because the mean of its divisors is an integer number (132806016).

Almost surely, 2^520156849 is an apocalyptic number.

It is an amenable number.

520156849 is a deficient number, since it is larger than the sum of its proper divisors (11067215).

520156849 is a wasteful number, since it uses less digits than its factorization.

520156849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11067214.

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 520156849 is about 22806.9473845142. The cubic root of 520156849 is about 804.2259957457.

The spelling of 520156849 in words is "five hundred twenty million, one hundred fifty-six thousand, eight hundred forty-nine".