128134091 has 2 divisors, whose sum is σ = 128134092. Its totient is φ = 128134090.

The previous prime is 128134087. The next prime is 128134121. The reversal of 128134091 is 190431821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128134091 - 2² = 128134087 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128134001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64067045 + 64067046.

It is an arithmetic number, because the mean of its divisors is an integer number (64067046).

Almost surely, 2^128134091 is an apocalyptic number.

128134091 is a deficient number, since it is larger than the sum of its proper divisors (1).

128134091 is an equidigital number, since it uses as much as digits as its factorization.

128134091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 128134091 is about 11319.6329887501. The cubic root of 128134091 is about 504.1443419510.

The spelling of 128134091 in words is "one hundred twenty-eight million, one hundred thirty-four thousand, ninety-one".