128594149 has 4 divisors (see below), whose sum is σ = 133028460. Its totient is φ = 124159840.

The previous prime is 128594143. The next prime is 128594177. The reversal of 128594149 is 941495821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75377124 + 53217025 = 8682^2 + 7295^2 .

It is a cyclic number.

It is not a de Polignac number, because 128594149 - 2⁵ = 128594117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128594143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2217112 + ... + 2217169.

It is an arithmetic number, because the mean of its divisors is an integer number (33257115).

Almost surely, 2^128594149 is an apocalyptic number.

It is an amenable number.

128594149 is a deficient number, since it is larger than the sum of its proper divisors (4434311).

128594149 is an equidigital number, since it uses as much as digits as its factorization.

128594149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4434310.

The product of its digits is 103680, while the sum is 43.

The square root of 128594149 is about 11339.9360227472. The cubic root of 128594149 is about 504.7469882476.

The spelling of 128594149 in words is "one hundred twenty-eight million, five hundred ninety-four thousand, one hundred forty-nine".