515551161 has 4 divisors (see below), whose sum is σ = 687401552. Its totient is φ = 343700772.

The previous prime is 515551159. The next prime is 515551171. The reversal of 515551161 is 161155515.

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 not a de Polignac number, because 515551161 - 2¹ = 515551159 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (515551121) 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, 85925191 + ... + 85925196.

It is an arithmetic number, because the mean of its divisors is an integer number (171850388).

Almost surely, 2^515551161 is an apocalyptic number.

It is an amenable number.

515551161 is a deficient number, since it is larger than the sum of its proper divisors (171850391).

515551161 is a wasteful number, since it uses less digits than its factorization.

515551161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171850390.

The product of its digits is 3750, while the sum is 30.

The square root of 515551161 is about 22705.7517162502. The cubic root of 515551161 is about 801.8453033177.

The spelling of 515551161 in words is "five hundred fifteen million, five hundred fifty-one thousand, one hundred sixty-one".