4499779981 has 2 divisors, whose sum is σ = 4499779982. Its totient is φ = 4499779980.

The previous prime is 4499779957. The next prime is 4499780017. The reversal of 4499779981 is 1899779944.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4184149225 + 315630756 = 64685^2 + 17766^2 .

It is a cyclic number.

It is not a de Polignac number, because 4499779981 - 2⁷ = 4499779853 is a prime.

It is a super-3 number, since 3×4499779981³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4499779931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2249889990 + 2249889991.

It is an arithmetic number, because the mean of its divisors is an integer number (2249889991).

Almost surely, 2^4499779981 is an apocalyptic number.

It is an amenable number.

4499779981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4499779981 is an equidigital number, since it uses as much as digits as its factorization.

4499779981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41150592, while the sum is 67.

The square root of 4499779981 is about 67080.3993801468. The cubic root of 4499779981 is about 1650.9367170928.

The spelling of 4499779981 in words is "four billion, four hundred ninety-nine million, seven hundred seventy-nine thousand, nine hundred eighty-one".