520215161 has 4 divisors (see below), whose sum is σ = 532313232. Its totient is φ = 508117092.

The previous prime is 520215149. The next prime is 520215191. The reversal of 520215161 is 161512025.

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 a cyclic number.

It is not a de Polignac number, because 520215161 - 2⁶ = 520215097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520215121) 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, 6048971 + ... + 6049056.

It is an arithmetic number, because the mean of its divisors is an integer number (133078308).

Almost surely, 2^520215161 is an apocalyptic number.

It is an amenable number.

520215161 is a deficient number, since it is larger than the sum of its proper divisors (12098071).

520215161 is a wasteful number, since it uses less digits than its factorization.

520215161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12098070.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 520215161 is about 22808.2257310822. The cubic root of 520215161 is about 804.2560471132.

Adding to 520215161 its reverse (161512025), we get a palindrome (681727186).

The spelling of 520215161 in words is "five hundred twenty million, two hundred fifteen thousand, one hundred sixty-one".