1009891927171 has 4 divisors (see below), whose sum is σ = 1042469086144. Its totient is φ = 977314768200.

The previous prime is 1009891927159. The next prime is 1009891927223. The reversal of 1009891927171 is 1717291989001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1009891927171 - 2²³ = 1009883538563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1009891927271) 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, 16288579440 + ... + 16288579501.

It is an arithmetic number, because the mean of its divisors is an integer number (260617271536).

Almost surely, 2^{1009891927171} is an apocalyptic number.

1009891927171 is a deficient number, since it is larger than the sum of its proper divisors (32577158973).

1009891927171 is an equidigital number, since it uses as much as digits as its factorization.

1009891927171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32577158972.

The product of its (nonzero) digits is 571536, while the sum is 55.

The spelling of 1009891927171 in words is "one trillion, nine billion, eight hundred ninety-one million, nine hundred twenty-seven thousand, one hundred seventy-one".