1001993887 has 2 divisors, whose sum is σ = 1001993888. Its totient is φ = 1001993886.

The previous prime is 1001993857. The next prime is 1001993959. The reversal of 1001993887 is 7883991001.

It is a weak prime.

It is an emirp because it is prime and its reverse (7883991001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1001993887 - 2²⁷ = 867776159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001993807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500996943 + 500996944.

It is an arithmetic number, because the mean of its divisors is an integer number (500996944).

Almost surely, 2^1001993887 is an apocalyptic number.

1001993887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001993887 is an equidigital number, since it uses as much as digits as its factorization.

1001993887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 1001993887 is about 31654.2870240351. The cubic root of 1001993887 is about 1000.6641877570.

The spelling of 1001993887 in words is "one billion, one million, nine hundred ninety-three thousand, eight hundred eighty-seven".