128124261 has 20 divisors (see below), whose sum is σ = 193197312. Its totient is φ = 84612168.

The previous prime is 128124253. The next prime is 128124263. The reversal of 128124261 is 162421821.

It is not a de Polignac number, because 128124261 - 2³ = 128124253 is a prime.

It is a super-2 number, since 2×128124261² = 32831652513592242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128124263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1276 + ... + 16058.

Almost surely, 2^128124261 is an apocalyptic number.

It is an amenable number.

128124261 is a deficient number, since it is larger than the sum of its proper divisors (65073051).

128124261 is a wasteful number, since it uses less digits than its factorization.

128124261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14902 (or 14893 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 128124261 is about 11319.1987790656. The cubic root of 128124261 is about 504.1314495569.

The spelling of 128124261 in words is "one hundred twenty-eight million, one hundred twenty-four thousand, two hundred sixty-one".