555521161 has 4 divisors (see below), whose sum is σ = 598253572. Its totient is φ = 512788752.

The previous prime is 555521159. The next prime is 555521191. The reversal of 555521161 is 161125555.

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 71301136 + 484220025 = 8444^2 + 22005^2 .

It is a cyclic number.

It is not a de Polignac number, because 555521161 - 2¹ = 555521159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (555521101) 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, 21366186 + ... + 21366211.

It is an arithmetic number, because the mean of its divisors is an integer number (149563393).

Almost surely, 2^555521161 is an apocalyptic number.

It is an amenable number.

555521161 is a deficient number, since it is larger than the sum of its proper divisors (42732411).

555521161 is a wasteful number, since it uses less digits than its factorization.

555521161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42732410.

The product of its digits is 7500, while the sum is 31.

The square root of 555521161 is about 23569.4964095544. The cubic root of 555521161 is about 822.0537262397.

The spelling of 555521161 in words is "five hundred fifty-five million, five hundred twenty-one thousand, one hundred sixty-one".