128601791 has 2 divisors, whose sum is σ = 128601792. Its totient is φ = 128601790.

The previous prime is 128601731. The next prime is 128601829. The reversal of 128601791 is 197106821.

It is a strong prime.

It is an emirp because it is prime and its reverse (197106821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128601791 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 (128601731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64300895 + 64300896.

It is an arithmetic number, because the mean of its divisors is an integer number (64300896).

Almost surely, 2^128601791 is an apocalyptic number.

128601791 is a deficient number, since it is larger than the sum of its proper divisors (1).

128601791 is an equidigital number, since it uses as much as digits as its factorization.

128601791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 35.

The square root of 128601791 is about 11340.2729684960. The cubic root of 128601791 is about 504.7569866291.

The spelling of 128601791 in words is "one hundred twenty-eight million, six hundred one thousand, seven hundred ninety-one".