4779449821 has 2 divisors, whose sum is σ = 4779449822. Its totient is φ = 4779449820.

The previous prime is 4779449771. The next prime is 4779449833. The reversal of 4779449821 is 1289449774.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4721613796 + 57836025 = 68714^2 + 7605^2 .

It is a cyclic number.

It is not a de Polignac number, because 4779449821 - 2¹¹ = 4779447773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4779449861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2389724910 + 2389724911.

It is an arithmetic number, because the mean of its divisors is an integer number (2389724911).

Almost surely, 2^4779449821 is an apocalyptic number.

It is an amenable number.

4779449821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4779449821 is an equidigital number, since it uses as much as digits as its factorization.

4779449821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 55.

The square root of 4779449821 is about 69133.5650823824. The cubic root of 4779449821 is about 1684.4545685675.

The spelling of 4779449821 in words is "four billion, seven hundred seventy-nine million, four hundred forty-nine thousand, eight hundred twenty-one".