520144331 has 4 divisors (see below), whose sum is σ = 594450672. Its totient is φ = 445837992.

The previous prime is 520144283. The next prime is 520144433. The reversal of 520144331 is 133441025.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520144331 is a prime.

It is a super-2 number, since 2×520144331² = 541100250142875122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 520144297 and 520144306.

It is not an unprimeable number, because it can be changed into a prime (520143331) 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, 37153160 + ... + 37153173.

It is an arithmetic number, because the mean of its divisors is an integer number (148612668).

Almost surely, 2^520144331 is an apocalyptic number.

520144331 is a deficient number, since it is larger than the sum of its proper divisors (74306341).

520144331 is an equidigital number, since it uses as much as digits as its factorization.

520144331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74306340.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 520144331 is about 22806.6729489419. The cubic root of 520144331 is about 804.2195442418.

Adding to 520144331 its reverse (133441025), we get a palindrome (653585356).

The spelling of 520144331 in words is "five hundred twenty million, one hundred forty-four thousand, three hundred thirty-one".