128161761 has 16 divisors (see below), whose sum is σ = 210317184. Its totient is φ = 67601664.

The previous prime is 128161757. The next prime is 128161799. The reversal of 128161761 is 167161821.

It is a happy number.

It is not a de Polignac number, because 128161761 - 2² = 128161757 is a prime.

It is a super-2 number, since 2×128161761² = 32850873965242242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128161961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234456 + ... + 235001.

It is an arithmetic number, because the mean of its divisors is an integer number (13144824).

Almost surely, 2^128161761 is an apocalyptic number.

It is an amenable number.

128161761 is a deficient number, since it is larger than the sum of its proper divisors (82155423).

128161761 is a wasteful number, since it uses less digits than its factorization.

128161761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469480.

The product of its digits is 4032, while the sum is 33.

The square root of 128161761 is about 11320.8551355452. The cubic root of 128161761 is about 504.1806285989.

The spelling of 128161761 in words is "one hundred twenty-eight million, one hundred sixty-one thousand, seven hundred sixty-one".