253181161 has 4 divisors (see below), whose sum is σ = 253213524. Its totient is φ = 253148800.

The previous prime is 253181147. The next prime is 253181177. The reversal of 253181161 is 161181352.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 241491600 + 11689561 = 15540^2 + 3419^2 .

It is a cyclic number.

It is not a de Polignac number, because 253181161 - 2¹⁵ = 253148393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253181111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3681 + ... + 22801.

It is an arithmetic number, because the mean of its divisors is an integer number (63303381).

Almost surely, 2^253181161 is an apocalyptic number.

It is an amenable number.

253181161 is a deficient number, since it is larger than the sum of its proper divisors (32363).

253181161 is a wasteful number, since it uses less digits than its factorization.

253181161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32362.

The product of its digits is 1440, while the sum is 28.

The square root of 253181161 is about 15911.6674487622. The cubic root of 253181161 is about 632.6212787483.

The spelling of 253181161 in words is "two hundred fifty-three million, one hundred eighty-one thousand, one hundred sixty-one".