9871291723 has 4 divisors (see below), whose sum is σ = 10451955960. Its totient is φ = 9290627488.

The previous prime is 9871291721. The next prime is 9871291783. The reversal of 9871291723 is 3271921789.

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 9871291723 - 2¹ = 9871291721 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9871291721) 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, 290332093 + ... + 290332126.

It is an arithmetic number, because the mean of its divisors is an integer number (2612988990).

Almost surely, 2^9871291723 is an apocalyptic number.

9871291723 is a deficient number, since it is larger than the sum of its proper divisors (580664237).

9871291723 is a wasteful number, since it uses less digits than its factorization.

9871291723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580664236.

The product of its digits is 381024, while the sum is 49.

The square root of 9871291723 is about 99354.3744532670. The cubic root of 9871291723 is about 2145.1516292599.

The spelling of 9871291723 in words is "nine billion, eight hundred seventy-one million, two hundred ninety-one thousand, seven hundred twenty-three".