9231921131 has 4 divisors (see below), whose sum is σ = 9243927000. Its totient is φ = 9219915264.

The previous prime is 9231921113. The next prime is 9231921151. The reversal of 9231921131 is 1311291329.

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: 1311291329 = 6959 ⋅188431.

It is a cyclic number.

It is not a de Polignac number, because 9231921131 - 2¹⁸ = 9231658987 is a prime.

It is a super-2 number, since 2×9231921131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9231921151) 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, 6001781 + ... + 6003318.

It is an arithmetic number, because the mean of its divisors is an integer number (2310981750).

Almost surely, 2^9231921131 is an apocalyptic number.

9231921131 is a deficient number, since it is larger than the sum of its proper divisors (12005869).

9231921131 is a wasteful number, since it uses less digits than its factorization.

9231921131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12005868.

The product of its digits is 2916, while the sum is 32.

The square root of 9231921131 is about 96082.8867749091. The cubic root of 9231921131 is about 2097.7997462295.

The spelling of 9231921131 in words is "nine billion, two hundred thirty-one million, nine hundred twenty-one thousand, one hundred thirty-one".