12181141157 has 2 divisors, whose sum is σ = 12181141158. Its totient is φ = 12181141156.

The previous prime is 12181141139. The next prime is 12181141207. The reversal of 12181141157 is 75114118121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12146023681 + 35117476 = 110209^2 + 5926^2 .

It is a cyclic number.

It is not a de Polignac number, because 12181141157 - 2¹⁰ = 12181140133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12181140157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6090570578 + 6090570579.

It is an arithmetic number, because the mean of its divisors is an integer number (6090570579).

Almost surely, 2^12181141157 is an apocalyptic number.

It is an amenable number.

12181141157 is a deficient number, since it is larger than the sum of its proper divisors (1).

12181141157 is an equidigital number, since it uses as much as digits as its factorization.

12181141157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 32.

Adding to 12181141157 its reverse (75114118121), we get a palindrome (87295259278).

The spelling of 12181141157 in words is "twelve billion, one hundred eighty-one million, one hundred forty-one thousand, one hundred fifty-seven".