4128819691 has 4 divisors (see below), whose sum is σ = 4147008552. Its totient is φ = 4110630832.

The previous prime is 4128819689. The next prime is 4128819701. The reversal of 4128819691 is 1969188214.

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 4128819691 - 2¹ = 4128819689 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4128819601) 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, 9094090 + ... + 9094543.

It is an arithmetic number, because the mean of its divisors is an integer number (1036752138).

Almost surely, 2^4128819691 is an apocalyptic number.

4128819691 is a deficient number, since it is larger than the sum of its proper divisors (18188861).

4128819691 is a wasteful number, since it uses less digits than its factorization.

4128819691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18188860.

The product of its digits is 248832, while the sum is 49.

The square root of 4128819691 is about 64255.8922667797. The cubic root of 4128819691 is about 1604.2620341008.

The spelling of 4128819691 in words is "four billion, one hundred twenty-eight million, eight hundred nineteen thousand, six hundred ninety-one".