551345161 has 2 divisors, whose sum is σ = 551345162. Its totient is φ = 551345160.

The previous prime is 551345159. The next prime is 551345231. The reversal of 551345161 is 161543155.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 481539136 + 69806025 = 21944^2 + 8355^2 .

It is a cyclic number.

It is not a de Polignac number, because 551345161 - 2¹ = 551345159 is a prime.

Together with 551345159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (551345111) 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 as a sum of consecutive naturals, namely, 275672580 + 275672581.

It is an arithmetic number, because the mean of its divisors is an integer number (275672581).

Almost surely, 2^551345161 is an apocalyptic number.

It is an amenable number.

551345161 is a deficient number, since it is larger than the sum of its proper divisors (1).

551345161 is an equidigital number, since it uses as much as digits as its factorization.

551345161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 31.

The square root of 551345161 is about 23480.7402140563. The cubic root of 551345161 is about 819.9886777140.

The spelling of 551345161 in words is "five hundred fifty-one million, three hundred forty-five thousand, one hundred sixty-one".