520340537 has 4 divisors (see below), whose sum is σ = 520466916. Its totient is φ = 520214160.

The previous prime is 520340519. The next prime is 520340543. The reversal of 520340537 is 735043025.

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

It can be written as a sum of positive squares in 2 ways, for example, as 492662416 + 27678121 = 22196^2 + 5261^2 .

It is a cyclic number.

It is not a de Polignac number, because 520340537 - 2⁸ = 520340281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520360537) 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, 56798 + ... + 65319.

It is an arithmetic number, because the mean of its divisors is an integer number (130116729).

Almost surely, 2^520340537 is an apocalyptic number.

It is an amenable number.

520340537 is a deficient number, since it is larger than the sum of its proper divisors (126379).

520340537 is a wasteful number, since it uses less digits than its factorization.

520340537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126378.

The product of its (nonzero) digits is 12600, while the sum is 29.

The square root of 520340537 is about 22810.9740475938. The cubic root of 520340537 is about 804.3206526291.

The spelling of 520340537 in words is "five hundred twenty million, three hundred forty thousand, five hundred thirty-seven".