128549263 has 4 divisors (see below), whose sum is σ = 130359888. Its totient is φ = 126738640.

The previous prime is 128549261. The next prime is 128549279. The reversal of 128549263 is 362945821.

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

It is a cyclic number.

It is not a de Polignac number, because 128549263 - 2¹ = 128549261 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 (128549261) 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, 905206 + ... + 905347.

It is an arithmetic number, because the mean of its divisors is an integer number (32589972).

Almost surely, 2^128549263 is an apocalyptic number.

128549263 is a deficient number, since it is larger than the sum of its proper divisors (1810625).

128549263 is an equidigital number, since it uses as much as digits as its factorization.

128549263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1810624.

The product of its digits is 103680, while the sum is 40.

The square root of 128549263 is about 11337.9567383193. The cubic root of 128549263 is about 504.6882538235.

The spelling of 128549263 in words is "one hundred twenty-eight million, five hundred forty-nine thousand, two hundred sixty-three".