128032131 has 4 divisors (see below), whose sum is σ = 170709512. Its totient is φ = 85354752.

The previous prime is 128032097. The next prime is 128032141. The reversal of 128032131 is 131230821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131230821 = 3 ⋅43743607.

It is not a de Polignac number, because 128032131 - 2⁶ = 128032067 is a prime.

It is a super-2 number, since 2×128032131² = 32784453136802322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128032098 and 128032107.

It is not an unprimeable number, because it can be changed into a prime (128032141) 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, 21338686 + ... + 21338691.

It is an arithmetic number, because the mean of its divisors is an integer number (42677378).

Almost surely, 2^128032131 is an apocalyptic number.

128032131 is a deficient number, since it is larger than the sum of its proper divisors (42677381).

128032131 is an equidigital number, since it uses as much as digits as its factorization.

128032131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42677380.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 128032131 is about 11315.1284128816. The cubic root of 128032131 is about 504.0105857250.

Adding to 128032131 its reverse (131230821), we get a palindrome (259262952).

It can be divided in two parts, 1280 and 32131, that added together give a triangular number (33411 = T₂₅₈).

The spelling of 128032131 in words is "one hundred twenty-eight million, thirty-two thousand, one hundred thirty-one".