128961751 has 8 divisors (see below), whose sum is σ = 130196000. Its totient is φ = 127733760.

The previous prime is 128961743. The next prime is 128961757. The reversal of 128961751 is 157169821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128961751 - 2³ = 128961743 is a prime.

It is a super-2 number, since 2×128961751² = 33262266441972002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128961757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46615 + ... + 49303.

It is an arithmetic number, because the mean of its divisors is an integer number (16274500).

Almost surely, 2^128961751 is an apocalyptic number.

128961751 is a deficient number, since it is larger than the sum of its proper divisors (1234249).

128961751 is a wasteful number, since it uses less digits than its factorization.

128961751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3129.

The product of its digits is 30240, while the sum is 40.

The square root of 128961751 is about 11356.1327484316. The cubic root of 128961751 is about 505.2274908784.

The spelling of 128961751 in words is "one hundred twenty-eight million, nine hundred sixty-one thousand, seven hundred fifty-one".