551522161 has 4 divisors (see below), whose sum is σ = 551586532. Its totient is φ = 551457792.

The previous prime is 551522149. The next prime is 551522189. The reversal of 551522161 is 161225155.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 417425761 + 134096400 = 20431^2 + 11580^2 .

It is a cyclic number.

It is not a de Polignac number, because 551522161 - 2⁷ = 551522033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551522141) 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 3 ways as a sum of consecutive naturals, for example, 16920 + ... + 37273.

It is an arithmetic number, because the mean of its divisors is an integer number (137896633).

It is a 8568-hyperperfect number.

Almost surely, 2^551522161 is an apocalyptic number.

It is an amenable number.

551522161 is a deficient number, since it is larger than the sum of its proper divisors (64371).

551522161 is a wasteful number, since it uses less digits than its factorization.

551522161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64370.

The product of its digits is 3000, while the sum is 28.

The square root of 551522161 is about 23484.5089580344. The cubic root of 551522161 is about 820.0764161385.

The spelling of 551522161 in words is "five hundred fifty-one million, five hundred twenty-two thousand, one hundred sixty-one".