10171391999 has 4 divisors (see below), whose sum is σ = 10706728440. Its totient is φ = 9636055560.

The previous prime is 10171391987. The next prime is 10171392017. The reversal of 10171391999 is 99919317101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99919317101 = 17971 ⋅5560031.

It is a cyclic number.

It is not a de Polignac number, because 10171391999 - 2²⁰ = 10170343423 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 (10171391099) 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, 267668192 + ... + 267668229.

It is an arithmetic number, because the mean of its divisors is an integer number (2676682110).

Almost surely, 2^10171391999 is an apocalyptic number.

10171391999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

10171391999 is a deficient number, since it is larger than the sum of its proper divisors (535336441).

10171391999 is an equidigital number, since it uses as much as digits as its factorization.

10171391999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535336440.

The product of its (nonzero) digits is 137781, while the sum is 50.

The spelling of 10171391999 in words is "ten billion, one hundred seventy-one million, three hundred ninety-one thousand, nine hundred ninety-nine".