128102791 has 2 divisors, whose sum is σ = 128102792. Its totient is φ = 128102790.

The previous prime is 128102743. The next prime is 128102833. The reversal of 128102791 is 197201821.

It is a strong prime.

It is an emirp because it is prime and its reverse (197201821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128102791 - 2¹⁵ = 128070023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128102291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64051395 + 64051396.

It is an arithmetic number, because the mean of its divisors is an integer number (64051396).

Almost surely, 2^128102791 is an apocalyptic number.

128102791 is a deficient number, since it is larger than the sum of its proper divisors (1).

128102791 is an equidigital number, since it uses as much as digits as its factorization.

128102791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 128102791 is about 11318.2503506505. The cubic root of 128102791 is about 504.1032885961.

The spelling of 128102791 in words is "one hundred twenty-eight million, one hundred two thousand, seven hundred ninety-one".