1001000009901 has 4 divisors (see below), whose sum is σ = 1334666679872. Its totient is φ = 667333339932.

The previous prime is 1001000009873. The next prime is 1001000009927. The reversal of 1001000009901 is 1099000001001.

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 1001000009901 - 2³⁷ = 863561056429 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 (1001000009201) 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, 166833334981 + ... + 166833334986.

It is an arithmetic number, because the mean of its divisors is an integer number (333666669968).

Almost surely, 2^{1001000009901} is an apocalyptic number.

It is an amenable number.

1001000009901 is a deficient number, since it is larger than the sum of its proper divisors (333666669971).

1001000009901 is an equidigital number, since it uses as much as digits as its factorization.

1001000009901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333666669970.

The product of its (nonzero) digits is 81, while the sum is 21.

The spelling of 1001000009901 in words is "one trillion, one billion, nine thousand, nine hundred one".