1993553963 has 2 divisors, whose sum is σ = 1993553964. Its totient is φ = 1993553962.

The previous prime is 1993553959. The next prime is 1993554037. The reversal of 1993553963 is 3693553991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1993553963 - 2² = 1993553959 is a prime.

It is not a weakly prime, because it can be changed into another prime (1993573963) 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, 996776981 + 996776982.

It is an arithmetic number, because the mean of its divisors is an integer number (996776982).

Almost surely, 2^1993553963 is an apocalyptic number.

1993553963 is a deficient number, since it is larger than the sum of its proper divisors (1).

1993553963 is an equidigital number, since it uses as much as digits as its factorization.

1993553963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2952450, while the sum is 53.

The square root of 1993553963 is about 44649.2325018023. The cubic root of 1993553963 is about 1258.5660101270.

The spelling of 1993553963 in words is "one billion, nine hundred ninety-three million, five hundred fifty-three thousand, nine hundred sixty-three".