515551284361 has 9 divisors (see below), whose sum is σ = 526788329799. Its totient is φ = 504549079224.

The previous prime is 515551284349. The next prime is 515551284371. The reversal of 515551284361 is 163482155515.

The square root of 515551284361 is 718019.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 41320725625 + 474230558736 = 203275^2 + 688644^2 .

It is not a de Polignac number, because 515551284361 - 2⁷ = 515551284233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (515551284371) 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 8 ways as a sum of consecutive naturals, for example, 33739255 + ... + 33754531.

Almost surely, 2^515551284361 is an apocalyptic number.

515551284361 is the 718019-th square number.

515551284361 is the 359010-th centered octagonal number.

It is an amenable number.

515551284361 is a deficient number, since it is larger than the sum of its proper divisors (11237045438).

515551284361 is an frugal number, since it uses more digits than its factorization.

515551284361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30648 (or 15324 counting only the distinct ones).

The product of its digits is 720000, while the sum is 46.

The spelling of 515551284361 in words is "five hundred fifteen billion, five hundred fifty-one million, two hundred eighty-four thousand, three hundred sixty-one".