12127747591 has 2 divisors, whose sum is σ = 12127747592.
Its totient is φ = 12127747590.
The previous prime is 12127747573. The next prime is 12127747663. The reversal of 12127747591 is 19574772121.
It is a happy number.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 12127747591 - 223 = 12119358983 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (12127747531) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6063873795 + 6063873796.
It is an arithmetic number, because the mean of its divisors is an integer number (6063873796).
Almost surely, 212127747591 is an apocalyptic number.
12127747591 is a deficient number, since it is larger than the sum of its proper divisors (1).
12127747591 is an equidigital number, since it uses as much as digits as its factorization.
12127747591 is an evil number, because the sum of its binary digits is even.
The product of its digits is 246960, while the sum is 46.
The spelling of 12127747591 in words is "twelve billion, one hundred twenty-seven million, seven hundred forty-seven thousand, five hundred ninety-one".