128873161 has 4 divisors (see below), whose sum is σ = 128905492. Its totient is φ = 128840832.

The previous prime is 128873149. The next prime is 128873167. The reversal of 128873161 is 161378821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6350400 + 122522761 = 2520^2 + 11069^2 .

It is a cyclic number.

It is not a de Polignac number, because 128873161 - 2⁷ = 128873033 is a prime.

It is a super-2 number, since 2×128873161² = 33216583252263842, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128873161.

It is not an unprimeable number, because it can be changed into a prime (128873167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9180 + ... + 18493.

It is an arithmetic number, because the mean of its divisors is an integer number (32226373).

Almost surely, 2^128873161 is an apocalyptic number.

It is an amenable number.

128873161 is a deficient number, since it is larger than the sum of its proper divisors (32331).

128873161 is an equidigital number, since it uses as much as digits as its factorization.

128873161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32330.

The product of its digits is 16128, while the sum is 37.

The square root of 128873161 is about 11352.2315427408. The cubic root of 128873161 is about 505.1117760616. Note that the first 3 decimals are identical.

The spelling of 128873161 in words is "one hundred twenty-eight million, eight hundred seventy-three thousand, one hundred sixty-one".