2505852181 has 4 divisors (see below), whose sum is σ = 2863831072. Its totient is φ = 2147873292.

The previous prime is 2505852149. The next prime is 2505852187. The reversal of 2505852181 is 1812585052.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2505852181 - 2⁵ = 2505852149 is a prime.

It is a super-4 number, since 4×2505852181⁴ (a number of 39 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an alternating number because its digits alternate between even and odd.

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 2505852181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2505852187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178989435 + ... + 178989448.

It is an arithmetic number, because the mean of its divisors is an integer number (715957768).

Almost surely, 2^2505852181 is an apocalyptic number.

It is an amenable number.

2505852181 is a deficient number, since it is larger than the sum of its proper divisors (357978891).

2505852181 is an equidigital number, since it uses as much as digits as its factorization.

2505852181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357978890.

The product of its (nonzero) digits is 32000, while the sum is 37.

The square root of 2505852181 is about 50058.4876020041. The cubic root of 2505852181 is about 1358.2670005756.

The spelling of 2505852181 in words is "two billion, five hundred five million, eight hundred fifty-two thousand, one hundred eighty-one".