394547081 has 2 divisors, whose sum is σ = 394547082. Its totient is φ = 394547080.

The previous prime is 394547063. The next prime is 394547113. The reversal of 394547081 is 180745493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 389707081 + 4840000 = 19741^2 + 2200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394547081 is a prime.

It is a super-2 number, since 2×394547081² = 311334798251241122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (394547981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197273540 + 197273541.

It is an arithmetic number, because the mean of its divisors is an integer number (197273541).

Almost surely, 2^394547081 is an apocalyptic number.

It is an amenable number.

394547081 is a deficient number, since it is larger than the sum of its proper divisors (1).

394547081 is an equidigital number, since it uses as much as digits as its factorization.

394547081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 394547081 is about 19863.2092321457. The cubic root of 394547081 is about 733.4428483597.

The spelling of 394547081 in words is "three hundred ninety-four million, five hundred forty-seven thousand, eighty-one".