520140031 has 4 divisors (see below), whose sum is σ = 522754000. Its totient is φ = 517526064.

The previous prime is 520139959. The next prime is 520140053. The reversal of 520140031 is 130041025.

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

It is a cyclic number.

It is not a de Polignac number, because 520140031 - 2⁷ = 520139903 is a prime.

It is a super-2 number, since 2×520140031² = 541091303697361922, 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 = 520139987 and 520140014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520146031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1306686 + ... + 1307083.

It is an arithmetic number, because the mean of its divisors is an integer number (130688500).

Almost surely, 2^520140031 is an apocalyptic number.

520140031 is a deficient number, since it is larger than the sum of its proper divisors (2613969).

520140031 is a wasteful number, since it uses less digits than its factorization.

520140031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2613968.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 520140031 is about 22806.5786780920. The cubic root of 520140031 is about 804.2173280918.

Adding to 520140031 its reverse (130041025), we get a palindrome (650181056).

The spelling of 520140031 in words is "five hundred twenty million, one hundred forty thousand, thirty-one".