4543871621 has 2 divisors, whose sum is σ = 4543871622. Its totient is φ = 4543871620.

The previous prime is 4543871587. The next prime is 4543871653. The reversal of 4543871621 is 1261783454.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4161669121 + 382202500 = 64511^2 + 19550^2 .

It is a cyclic number.

It is not a de Polignac number, because 4543871621 - 2⁶ = 4543871557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4543871681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2271935810 + 2271935811.

It is an arithmetic number, because the mean of its divisors is an integer number (2271935811).

Almost surely, 2^4543871621 is an apocalyptic number.

It is an amenable number.

4543871621 is a deficient number, since it is larger than the sum of its proper divisors (1).

4543871621 is an equidigital number, since it uses as much as digits as its factorization.

4543871621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 41.

The square root of 4543871621 is about 67408.2459421694. The cubic root of 4543871621 is about 1656.3115012055.

The spelling of 4543871621 in words is "four billion, five hundred forty-three million, eight hundred seventy-one thousand, six hundred twenty-one".