4619648821 has 2 divisors, whose sum is σ = 4619648822. Its totient is φ = 4619648820.

The previous prime is 4619648779. The next prime is 4619648843. The reversal of 4619648821 is 1288469164.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4581394596 + 38254225 = 67686^2 + 6185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4619648821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4619648921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2309824410 + 2309824411.

It is an arithmetic number, because the mean of its divisors is an integer number (2309824411).

Almost surely, 2^4619648821 is an apocalyptic number.

It is an amenable number.

4619648821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4619648821 is an equidigital number, since it uses as much as digits as its factorization.

4619648821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 663552, while the sum is 49.

The square root of 4619648821 is about 67967.9985066502. The cubic root of 4619648821 is about 1665.4681079119.

The spelling of 4619648821 in words is "four billion, six hundred nineteen million, six hundred forty-eight thousand, eight hundred twenty-one".