4128627991 has 4 divisors (see below), whose sum is σ = 4128969592. Its totient is φ = 4128286392.

The previous prime is 4128627977. The next prime is 4128628013. The reversal of 4128627991 is 1997268214.

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 4128627991 - 2⁵ = 4128627959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4128627961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151980 + ... + 177073.

It is an arithmetic number, because the mean of its divisors is an integer number (1032242398).

Almost surely, 2^4128627991 is an apocalyptic number.

4128627991 is a deficient number, since it is larger than the sum of its proper divisors (341601).

4128627991 is a wasteful number, since it uses less digits than its factorization.

4128627991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341600.

The product of its digits is 435456, while the sum is 49.

The square root of 4128627991 is about 64254.4005574715. The cubic root of 4128627991 is about 1604.2372052300.

The spelling of 4128627991 in words is "four billion, one hundred twenty-eight million, six hundred twenty-seven thousand, nine hundred ninety-one".