128102291 has 2 divisors, whose sum is σ = 128102292. Its totient is φ = 128102290.

The previous prime is 128102287. The next prime is 128102297. The reversal of 128102291 is 192201821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128102291 - 2² = 128102287 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128102291.

It is not a weakly prime, because it can be changed into another prime (128102297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64051145 + 64051146.

It is an arithmetic number, because the mean of its divisors is an integer number (64051146).

Almost surely, 2^128102291 is an apocalyptic number.

128102291 is a deficient number, since it is larger than the sum of its proper divisors (1).

128102291 is an equidigital number, since it uses as much as digits as its factorization.

128102291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 128102291 is about 11318.2282624093. The cubic root of 128102291 is about 504.1026327374.

The spelling of 128102291 in words is "one hundred twenty-eight million, one hundred two thousand, two hundred ninety-one".