128597261 has 8 divisors (see below), whose sum is σ = 138631584. Its totient is φ = 118583280.

The previous prime is 128597243. The next prime is 128597267. The reversal of 128597261 is 162795821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128597261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128597267) 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, 9650 + ... + 18716.

It is an arithmetic number, because the mean of its divisors is an integer number (17328948).

Almost surely, 2^128597261 is an apocalyptic number.

It is an amenable number.

128597261 is a deficient number, since it is larger than the sum of its proper divisors (10034323).

128597261 is a wasteful number, since it uses less digits than its factorization.

128597261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10171.

The product of its digits is 60480, while the sum is 41.

The square root of 128597261 is about 11340.0732360951. The cubic root of 128597261 is about 504.7510598687.

The spelling of 128597261 in words is "one hundred twenty-eight million, five hundred ninety-seven thousand, two hundred sixty-one".