1000991000901 has 4 divisors (see below), whose sum is σ = 1334654667872. Its totient is φ = 667327333932.

The previous prime is 1000991000899. The next prime is 1000991000917. The reversal of 1000991000901 is 1090001990001.

1000991000901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1000991000901 - 2¹ = 1000991000899 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000991000101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166831833481 + ... + 166831833486.

It is an arithmetic number, because the mean of its divisors is an integer number (333663666968).

Almost surely, 2^{1000991000901} is an apocalyptic number.

It is an amenable number.

1000991000901 is a deficient number, since it is larger than the sum of its proper divisors (333663666971).

1000991000901 is an equidigital number, since it uses as much as digits as its factorization.

1000991000901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333663666970.

The product of its (nonzero) digits is 729, while the sum is 30.

Adding to 1000991000901 its reverse (1090001990001), we get a palindrome (2090992990902).

The spelling of 1000991000901 in words is "one trillion, nine hundred ninety-one million, nine hundred one", and thus it is an aban number.