2504220161 has 4 divisors (see below), whose sum is σ = 2551469652. Its totient is φ = 2456970672.

The previous prime is 2504220157. The next prime is 2504220167. The reversal of 2504220161 is 1610224052.

It is a happy number.

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 667240561 + 1836979600 = 25831^2 + 42860^2 .

It is a cyclic number.

It is not a de Polignac number, because 2504220161 - 2² = 2504220157 is a prime.

It is a super-2 number, since 2×2504220161² = 12542237229517731842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2504220167) 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 in 3 ways as a sum of consecutive naturals, for example, 23624666 + ... + 23624771.

It is an arithmetic number, because the mean of its divisors is an integer number (637867413).

Almost surely, 2^2504220161 is an apocalyptic number.

It is an amenable number.

2504220161 is a deficient number, since it is larger than the sum of its proper divisors (47249491).

2504220161 is an equidigital number, since it uses as much as digits as its factorization.

2504220161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47249490.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 2504220161 is about 50042.1838152573. The cubic root of 2504220161 is about 1357.9720642742.

The spelling of 2504220161 in words is "two billion, five hundred four million, two hundred twenty thousand, one hundred sixty-one".