128154249 has 6 divisors (see below), whose sum is σ = 185111706. Its totient is φ = 85436160.

The previous prime is 128154239. The next prime is 128154251. The reversal of 128154249 is 942451821.

It can be written as a sum of positive squares in only one way, i.e., 127238400 + 915849 = 11280^2 + 957^2 .

It is not a de Polignac number, because 128154249 - 2¹⁶ = 128088713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128154239) 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, 7119672 + ... + 7119689.

It is an arithmetic number, because the mean of its divisors is an integer number (30851951).

Almost surely, 2^128154249 is an apocalyptic number.

It is an amenable number.

128154249 is a deficient number, since it is larger than the sum of its proper divisors (56957457).

128154249 is a wasteful number, since it uses less digits than its factorization.

128154249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14239367 (or 14239364 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 128154249 is about 11320.5233536264. The cubic root of 128154249 is about 504.1707778217.

The spelling of 128154249 in words is "one hundred twenty-eight million, one hundred fifty-four thousand, two hundred forty-nine".