521601113 has 6 divisors (see below), whose sum is σ = 573330282. Its totient is φ = 474182720.

The previous prime is 521601109. The next prime is 521601131. The reversal of 521601113 is 311106125.

It can be written as a sum of positive squares in only one way, i.e., 406103104 + 115498009 = 20152^2 + 10747^2 .

It is not a de Polignac number, because 521601113 - 2² = 521601109 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521601103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2155256 + ... + 2155497.

It is an arithmetic number, because the mean of its divisors is an integer number (95555047).

Almost surely, 2^521601113 is an apocalyptic number.

It is an amenable number.

521601113 is a deficient number, since it is larger than the sum of its proper divisors (51729169).

521601113 is a wasteful number, since it uses less digits than its factorization.

521601113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4310775 (or 4310764 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 521601113 is about 22838.5882444603. The cubic root of 521601113 is about 804.9696440593.

Adding to 521601113 its reverse (311106125), we get a palindrome (832707238).

The spelling of 521601113 in words is "five hundred twenty-one million, six hundred one thousand, one hundred thirteen".