551322161 has 16 divisors (see below), whose sum is σ = 615762000. Its totient is φ = 490119168.

The previous prime is 551322157. The next prime is 551322193. The reversal of 551322161 is 161223155.

It can be written as a sum of positive squares in 8 ways, for example, as 2825761 + 548496400 = 1681^2 + 23420^2 .

It is a cyclic number.

It is not a de Polignac number, because 551322161 - 2² = 551322157 is a prime.

It is a super-2 number, since 2×551322161² = 607912250419419842, which contains 22 as substring.

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 551322161.

It is not an unprimeable number, because it can be changed into a prime (551322131) 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 15 ways as a sum of consecutive naturals, for example, 167645 + ... + 170901.

It is an arithmetic number, because the mean of its divisors is an integer number (38485125).

Almost surely, 2^551322161 is an apocalyptic number.

It is an amenable number.

551322161 is a deficient number, since it is larger than the sum of its proper divisors (64439839).

551322161 is a wasteful number, since it uses less digits than its factorization.

551322161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3748.

The product of its digits is 1800, while the sum is 26.

The square root of 551322161 is about 23480.2504458534. The cubic root of 551322161 is about 819.9772752973.

The spelling of 551322161 in words is "five hundred fifty-one million, three hundred twenty-two thousand, one hundred sixty-one".