9891749231 has 8 divisors (see below), whose sum is σ = 12174460704. Its totient is φ = 7826438880.

The previous prime is 9891749209. The next prime is 9891749249. The reversal of 9891749231 is 1329471989.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9891749231 - 2⁶ = 9891749167 is a prime.

It is a super-2 number, since 2×9891749231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9891746231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54350180 + ... + 54350361.

It is an arithmetic number, because the mean of its divisors is an integer number (1521807588).

Almost surely, 2^9891749231 is an apocalyptic number.

9891749231 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

9891749231 is a deficient number, since it is larger than the sum of its proper divisors (2282711473).

9891749231 is a wasteful number, since it uses less digits than its factorization.

9891749231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108700561.

The product of its digits is 979776, while the sum is 53.

The square root of 9891749231 is about 99457.2733941565. The cubic root of 9891749231 is about 2146.6324950865.

The spelling of 9891749231 in words is "nine billion, eight hundred ninety-one million, seven hundred forty-nine thousand, two hundred thirty-one".