131211181 has 2 divisors, whose sum is σ = 131211182. Its totient is φ = 131211180.

The previous prime is 131211173. The next prime is 131211229. The reversal of 131211181 is 181112131.

It is a m-pointer prime, because the next prime (131211229) can be obtained adding 131211181 to its product of digits (48).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87254281 + 43956900 = 9341^2 + 6630^2 .

It is a cyclic number.

It is not a de Polignac number, because 131211181 - 2³ = 131211173 is a prime.

It is a super-2 number, since 2×131211181² = 34432748038829522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131211281) 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 as a sum of consecutive naturals, namely, 65605590 + 65605591.

It is an arithmetic number, because the mean of its divisors is an integer number (65605591).

Almost surely, 2^131211181 is an apocalyptic number.

It is an amenable number.

131211181 is a deficient number, since it is larger than the sum of its proper divisors (1).

131211181 is an equidigital number, since it uses as much as digits as its factorization.

131211181 is an odious number, because the sum of its binary digits is odd.

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

The square root of 131211181 is about 11454.7449120441. The cubic root of 131211181 is about 508.1480712574.

The spelling of 131211181 in words is "one hundred thirty-one million, two hundred eleven thousand, one hundred eighty-one".