126147991 has 2 divisors, whose sum is σ = 126147992. Its totient is φ = 126147990.

The previous prime is 126147979. The next prime is 126147997. The reversal of 126147991 is 199741621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126147991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126147997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63073995 + 63073996.

It is an arithmetic number, because the mean of its divisors is an integer number (63073996).

Almost surely, 2^126147991 is an apocalyptic number.

126147991 is a deficient number, since it is larger than the sum of its proper divisors (1).

126147991 is an equidigital number, since it uses as much as digits as its factorization.

126147991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 40.

The square root of 126147991 is about 11231.5622688921. The cubic root of 126147991 is about 501.5259926217.

The spelling of 126147991 in words is "one hundred twenty-six million, one hundred forty-seven thousand, nine hundred ninety-one".