128692243 has 2 divisors, whose sum is σ = 128692244. Its totient is φ = 128692242.

The previous prime is 128692219. The next prime is 128692273. The reversal of 128692243 is 342296821.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (342296821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128692243 - 2²⁵ = 95137811 is a prime.

It is not a weakly prime, because it can be changed into another prime (128692273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64346121 + 64346122.

It is an arithmetic number, because the mean of its divisors is an integer number (64346122).

Almost surely, 2^128692243 is an apocalyptic number.

128692243 is a deficient number, since it is larger than the sum of its proper divisors (1).

128692243 is an equidigital number, since it uses as much as digits as its factorization.

128692243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 37.

The square root of 128692243 is about 11344.2603549108. The cubic root of 128692243 is about 504.8752990794.

The spelling of 128692243 in words is "one hundred twenty-eight million, six hundred ninety-two thousand, two hundred forty-three".