128131267 has 4 divisors (see below), whose sum is σ = 139779576. Its totient is φ = 116482960.

The previous prime is 128131249. The next prime is 128131291. The reversal of 128131267 is 762131821.

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

It is a de Polignac number, because none of the positive numbers 2^k-128131267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128131207) 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, 5824138 + ... + 5824159.

It is an arithmetic number, because the mean of its divisors is an integer number (34944894).

Almost surely, 2^128131267 is an apocalyptic number.

128131267 is a deficient number, since it is larger than the sum of its proper divisors (11648309).

128131267 is a wasteful number, since it uses less digits than its factorization.

128131267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11648308.

The product of its digits is 4032, while the sum is 31.

The square root of 128131267 is about 11319.5082490363. The cubic root of 128131267 is about 504.1406382422.

The spelling of 128131267 in words is "one hundred twenty-eight million, one hundred thirty-one thousand, two hundred sixty-seven".