551215361 has 4 divisors (see below), whose sum is σ = 583639812. Its totient is φ = 518790912.

The previous prime is 551215351. The next prime is 551215363. The reversal of 551215361 is 163512155.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 477684736 + 73530625 = 21856^2 + 8575^2 .

It is a cyclic number.

It is not a de Polignac number, because 551215361 - 2¹⁰ = 551214337 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 (551215363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16212200 + ... + 16212233.

It is an arithmetic number, because the mean of its divisors is an integer number (145909953).

Almost surely, 2^551215361 is an apocalyptic number.

It is an amenable number.

551215361 is a deficient number, since it is larger than the sum of its proper divisors (32424451).

551215361 is a wasteful number, since it uses less digits than its factorization.

551215361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32424450.

The product of its digits is 4500, while the sum is 29.

The square root of 551215361 is about 23477.9760839813. The cubic root of 551215361 is about 819.9243242675.

The spelling of 551215361 in words is "five hundred fifty-one million, two hundred fifteen thousand, three hundred sixty-one".