128597491 has 8 divisors (see below), whose sum is σ = 147672000. Its totient is φ = 110753640.

The previous prime is 128597473. The next prime is 128597501. The reversal of 128597491 is 194795821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128597491 - 2⁷ = 128597363 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (128597411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307441 + ... + 307858.

It is an arithmetic number, because the mean of its divisors is an integer number (18459000).

Almost surely, 2^128597491 is an apocalyptic number.

128597491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

128597491 is a deficient number, since it is larger than the sum of its proper divisors (19074509).

128597491 is a wasteful number, since it uses less digits than its factorization.

128597491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615329.

The product of its digits is 181440, while the sum is 46.

The square root of 128597491 is about 11340.0833771185. The cubic root of 128597491 is about 504.7513607893.

The spelling of 128597491 in words is "one hundred twenty-eight million, five hundred ninety-seven thousand, four hundred ninety-one".