12131122987 has 2 divisors, whose sum is σ = 12131122988. Its totient is φ = 12131122986.

The previous prime is 12131122981. The next prime is 12131123033. The reversal of 12131122987 is 78922113121.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (78922113121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12131122987 - 2³¹ = 9983639339 is a prime.

It is not a weakly prime, because it can be changed into another prime (12131122981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6065561493 + 6065561494.

It is an arithmetic number, because the mean of its divisors is an integer number (6065561494).

Almost surely, 2^12131122987 is an apocalyptic number.

12131122987 is a deficient number, since it is larger than the sum of its proper divisors (1).

12131122987 is an equidigital number, since it uses as much as digits as its factorization.

12131122987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 37.

The spelling of 12131122987 in words is "twelve billion, one hundred thirty-one million, one hundred twenty-two thousand, nine hundred eighty-seven".