4394080981 has 2 divisors, whose sum is σ = 4394080982. Its totient is φ = 4394080980.

The previous prime is 4394080979. The next prime is 4394081009. The reversal of 4394080981 is 1890804934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3845116081 + 548964900 = 62009^2 + 23430^2 .

It is a cyclic number.

It is not a de Polignac number, because 4394080981 - 2¹ = 4394080979 is a prime.

It is a super-2 number, since 2×4394080981² = 38615895335171844722, which contains 22 as substring.

Together with 4394080979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4394080681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2197040490 + 2197040491.

It is an arithmetic number, because the mean of its divisors is an integer number (2197040491).

Almost surely, 2^4394080981 is an apocalyptic number.

It is an amenable number.

4394080981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4394080981 is an equidigital number, since it uses as much as digits as its factorization.

4394080981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 4394080981 is about 66287.8645077664. The cubic root of 4394080981 is about 1637.9074268988.

The spelling of 4394080981 in words is "four billion, three hundred ninety-four million, eighty thousand, nine hundred eighty-one".