4569421991 has 4 divisors (see below), whose sum is σ = 4624475352. Its totient is φ = 4514368632.

The previous prime is 4569421981. The next prime is 4569422009. The reversal of 4569421991 is 1991249654.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1991249654 = 2 ⋅995624827.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4569421991 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 (4569421931) 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, 27526556 + ... + 27526721.

It is an arithmetic number, because the mean of its divisors is an integer number (1156118838).

Almost surely, 2^4569421991 is an apocalyptic number.

4569421991 is a deficient number, since it is larger than the sum of its proper divisors (55053361).

4569421991 is an equidigital number, since it uses as much as digits as its factorization.

4569421991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55053360.

The product of its digits is 699840, while the sum is 50.

The square root of 4569421991 is about 67597.4998872000. The cubic root of 4569421991 is about 1659.4102021163.

The spelling of 4569421991 in words is "four billion, five hundred sixty-nine million, four hundred twenty-one thousand, nine hundred ninety-one".