4521929891 has 4 divisors (see below), whose sum is σ = 4522752984. Its totient is φ = 4521106800.

The previous prime is 4521929821. The next prime is 4521929921. The reversal of 4521929891 is 1989291254.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1989291254 = 2 ⋅994645627.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4521929891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4521929821) 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, 403250 + ... + 414311.

It is an arithmetic number, because the mean of its divisors is an integer number (1130688246).

Almost surely, 2^4521929891 is an apocalyptic number.

4521929891 is a deficient number, since it is larger than the sum of its proper divisors (823093).

4521929891 is an equidigital number, since it uses as much as digits as its factorization.

4521929891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823092.

The product of its digits is 466560, while the sum is 50.

The square root of 4521929891 is about 67245.2964228726. The cubic root of 4521929891 is about 1653.6411650096.

The spelling of 4521929891 in words is "four billion, five hundred twenty-one million, nine hundred twenty-nine thousand, eight hundred ninety-one".