1603432661 has 2 divisors, whose sum is σ = 1603432662. Its totient is φ = 1603432660.

The previous prime is 1603432643. The next prime is 1603432697. The reversal of 1603432661 is 1662343061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 901500625 + 701932036 = 30025^2 + 26494^2 .

It is an emirp because it is prime and its reverse (1662343061) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1603432661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1603432261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 801716330 + 801716331.

It is an arithmetic number, because the mean of its divisors is an integer number (801716331).

Almost surely, 2^1603432661 is an apocalyptic number.

It is an amenable number.

1603432661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1603432661 is an equidigital number, since it uses as much as digits as its factorization.

1603432661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 1603432661 is about 40042.8852731668. The cubic root of 1603432661 is about 1170.4429279721.

The spelling of 1603432661 in words is "one billion, six hundred three million, four hundred thirty-two thousand, six hundred sixty-one".