1993891463 has 2 divisors, whose sum is σ = 1993891464. Its totient is φ = 1993891462.

The previous prime is 1993891439. The next prime is 1993891517. The reversal of 1993891463 is 3641983991.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (3641983991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1993891463 - 2¹⁰ = 1993890439 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1993891363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 996945731 + 996945732.

It is an arithmetic number, because the mean of its divisors is an integer number (996945732).

Almost surely, 2^1993891463 is an apocalyptic number.

1993891463 is a deficient number, since it is larger than the sum of its proper divisors (1).

1993891463 is an equidigital number, since it uses as much as digits as its factorization.

1993891463 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1259712, while the sum is 53.

The square root of 1993891463 is about 44653.0118021170. The cubic root of 1993891463 is about 1258.6370293667.

The spelling of 1993891463 in words is "one billion, nine hundred ninety-three million, eight hundred ninety-one thousand, four hundred sixty-three".