4521994591 has 4 divisors (see below), whose sum is σ = 4632287184. Its totient is φ = 4411702000.

The previous prime is 4521994573. The next prime is 4521994613. The reversal of 4521994591 is 1954991254.

It is a happy number.

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 4521994591 - 2²¹ = 4519897439 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 (4521994501) 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, 55146235 + ... + 55146316.

It is an arithmetic number, because the mean of its divisors is an integer number (1158071796).

Almost surely, 2^4521994591 is an apocalyptic number.

4521994591 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

4521994591 is a deficient number, since it is larger than the sum of its proper divisors (110292593).

4521994591 is a wasteful number, since it uses less digits than its factorization.

4521994591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110292592.

The product of its digits is 583200, while the sum is 49.

The square root of 4521994591 is about 67245.7774956911. Note that the first 3 decimals coincide. The cubic root of 4521994591 is about 1653.6490517656.

The spelling of 4521994591 in words is "four billion, five hundred twenty-one million, nine hundred ninety-four thousand, five hundred ninety-one".