128261751 has 16 divisors (see below), whose sum is σ = 177224160. Its totient is φ = 82512192.

The previous prime is 128261743. The next prime is 128261767. The reversal of 128261751 is 157162821.

It is not a de Polignac number, because 128261751 - 2³ = 128261743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128261701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72291 + ... + 74043.

It is an arithmetic number, because the mean of its divisors is an integer number (11076510).

Almost surely, 2^128261751 is an apocalyptic number.

128261751 is a deficient number, since it is larger than the sum of its proper divisors (48962409).

128261751 is an frugal number, since it uses more digits than its factorization.

128261751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843 (or 1785 counting only the distinct ones).

The product of its digits is 6720, while the sum is 33.

The square root of 128261751 is about 11325.2704603466. The cubic root of 128261751 is about 504.3117127222.

The spelling of 128261751 in words is "one hundred twenty-eight million, two hundred sixty-one thousand, seven hundred fifty-one".