9209871231 has 16 divisors (see below), whose sum is σ = 13398113280. Its totient is φ = 5580933120.

The previous prime is 9209871221. The next prime is 9209871247. The reversal of 9209871231 is 1321789029.

It is not a de Polignac number, because 9209871231 - 2⁵ = 9209871199 is a prime.

It is a super-2 number, since 2×9209871231² (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 (9209871221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 276735 + ... + 308223.

It is an arithmetic number, because the mean of its divisors is an integer number (837382080).

Almost surely, 2^9209871231 is an apocalyptic number.

9209871231 is a deficient number, since it is larger than the sum of its proper divisors (4188242049).

9209871231 is a wasteful number, since it uses less digits than its factorization.

9209871231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40366.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 9209871231 is about 95968.0740194363. The cubic root of 9209871231 is about 2096.1282577167.

The spelling of 9209871231 in words is "nine billion, two hundred nine million, eight hundred seventy-one thousand, two hundred thirty-one".