128133091 has 2 divisors, whose sum is σ = 128133092. Its totient is φ = 128133090.

The previous prime is 128133059. The next prime is 128133113. The reversal of 128133091 is 190331821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128133091 - 2⁵ = 128133059 is a prime.

It is equal to p_7278202 and since 128133091 and 7278202 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (128133791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64066545 + 64066546.

It is an arithmetic number, because the mean of its divisors is an integer number (64066546).

Almost surely, 2^128133091 is an apocalyptic number.

128133091 is a deficient number, since it is larger than the sum of its proper divisors (1).

128133091 is an equidigital number, since it uses as much as digits as its factorization.

128133091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 128133091 is about 11319.5888176205. The cubic root of 128133091 is about 504.1430304456.

The spelling of 128133091 in words is "one hundred twenty-eight million, one hundred thirty-three thousand, ninety-one".