128621167 has 4 divisors (see below), whose sum is σ = 136187136. Its totient is φ = 121055200.

The previous prime is 128621159. The next prime is 128621179. The reversal of 128621167 is 761126821.

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

It is a cyclic number.

It is not a de Polignac number, because 128621167 - 2³ = 128621159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128621117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3782959 + ... + 3782992.

It is an arithmetic number, because the mean of its divisors is an integer number (34046784).

Almost surely, 2^128621167 is an apocalyptic number.

128621167 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

128621167 is a deficient number, since it is larger than the sum of its proper divisors (7565969).

128621167 is an equidigital number, since it uses as much as digits as its factorization.

128621167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7565968.

The product of its digits is 8064, while the sum is 34.

The square root of 128621167 is about 11341.1272367433. The cubic root of 128621167 is about 504.7823353695.

Adding to 128621167 its reverse (761126821), we get a palindrome (889747988).

The spelling of 128621167 in words is "one hundred twenty-eight million, six hundred twenty-one thousand, one hundred sixty-seven".