403081661 has 2 divisors, whose sum is σ = 403081662. Its totient is φ = 403081660.

The previous prime is 403081649. The next prime is 403081703. The reversal of 403081661 is 166180304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 398800900 + 4280761 = 19970^2 + 2069^2 .

It is a cyclic number.

It is not a de Polignac number, because 403081661 - 2⁶ = 403081597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (403071661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201540830 + 201540831.

It is an arithmetic number, because the mean of its divisors is an integer number (201540831).

Almost surely, 2^403081661 is an apocalyptic number.

It is an amenable number.

403081661 is a deficient number, since it is larger than the sum of its proper divisors (1).

403081661 is an equidigital number, since it uses as much as digits as its factorization.

403081661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 403081661 is about 20076.8937089381. The cubic root of 403081661 is about 738.6936172986.

The spelling of 403081661 in words is "four hundred three million, eighty-one thousand, six hundred sixty-one".