131121181 has 2 divisors, whose sum is σ = 131121182. Its totient is φ = 131121180.

The previous prime is 131121161. The next prime is 131121241. The reversal of 131121181 is 181121131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128368900 + 2752281 = 11330^2 + 1659^2 .

It is a cyclic number.

It is not a de Polignac number, because 131121181 - 2⁵ = 131121149 is a prime.

It is a super-2 number, since 2×131121181² = 34385528213669522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131121121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65560590 + 65560591.

It is an arithmetic number, because the mean of its divisors is an integer number (65560591).

Almost surely, 2^131121181 is an apocalyptic number.

It is an amenable number.

131121181 is a deficient number, since it is larger than the sum of its proper divisors (1).

131121181 is an equidigital number, since it uses as much as digits as its factorization.

131121181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48, while the sum is 19.

The square root of 131121181 is about 11450.8157351343. The cubic root of 131121181 is about 508.0318621903.

The spelling of 131121181 in words is "one hundred thirty-one million, one hundred twenty-one thousand, one hundred eighty-one".