515610161 has 12 divisors (see below), whose sum is σ = 567816900. Its totient is φ = 467850240.

The previous prime is 515610149. The next prime is 515610191. The reversal of 515610161 is 161016515.

It can be written as a sum of positive squares in 2 ways, for example, as 165920161 + 349690000 = 12881^2 + 18700^2 .

It is not a de Polignac number, because 515610161 - 2⁶ = 515610097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 515610161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515610191) 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 11 ways as a sum of consecutive naturals, for example, 65105 + ... + 72593.

It is an arithmetic number, because the mean of its divisors is an integer number (47318075).

Almost surely, 2^515610161 is an apocalyptic number.

It is an amenable number.

515610161 is a deficient number, since it is larger than the sum of its proper divisors (52206739).

515610161 is a wasteful number, since it uses less digits than its factorization.

515610161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8080 (or 8069 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 515610161 is about 22707.0509093541. The cubic root of 515610161 is about 801.8758900451.

Adding to 515610161 its reverse (161016515), we get a palindrome (676626676).

The spelling of 515610161 in words is "five hundred fifteen million, six hundred ten thousand, one hundred sixty-one".