2505181 has 4 divisors (see below), whose sum is σ = 2863072. Its totient is φ = 2147292.

The previous prime is 2505163. The next prime is 2505187. The reversal of 2505181 is 1815052.

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 not a de Polignac number, because 2505181 - 2⁹ = 2504669 is a prime.

It is a super-2 number, since 2×2505181² = 12551863685522, which contains 22 as substring.

It is a Duffinian number.

2505181 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2505187) 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, 178935 + ... + 178948.

It is an arithmetic number, because the mean of its divisors is an integer number (715768).

2^2505181 is an apocalyptic number.

It is an amenable number.

2505181 is a deficient number, since it is larger than the sum of its proper divisors (357891).

2505181 is an equidigital number, since it uses as much as digits as its factorization.

2505181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357890.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 2505181 is about 1582.7763581757. The cubic root of 2505181 is about 135.8145721221.

The spelling of 2505181 in words is "two million, five hundred five thousand, one hundred eighty-one".