128847249 has 6 divisors (see below), whose sum is σ = 186112706. Its totient is φ = 85898160.

The previous prime is 128847247. The next prime is 128847269. The reversal of 128847249 is 942748821.

It can be written as a sum of positive squares in only one way, i.e., 92160000 + 36687249 = 9600^2 + 6057^2 .

It is not a de Polignac number, because 128847249 - 2¹ = 128847247 is a prime.

It is a super-2 number, since 2×128847249² = 33203227149736002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128847241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7158172 + ... + 7158189.

Almost surely, 2^128847249 is an apocalyptic number.

It is an amenable number.

128847249 is a deficient number, since it is larger than the sum of its proper divisors (57265457).

128847249 is a wasteful number, since it uses less digits than its factorization.

128847249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14316367 (or 14316364 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 128847249 is about 11351.0902119576. The cubic root of 128847249 is about 505.0779202054.

The spelling of 128847249 in words is "one hundred twenty-eight million, eight hundred forty-seven thousand, two hundred forty-nine".