9991231331204 has 6 divisors (see below), whose sum is σ = 17484654829614. Its totient is φ = 4995615665600.

The previous prime is 9991231331203. The next prime is 9991231331219. The reversal of 9991231331204 is 4021331321999.

It can be written as a sum of positive squares in only one way, i.e., 9842776782400 + 148454548804 = 3137320^2 + 385298^2 .

It is not an unprimeable number, because it can be changed into a prime (9991231331203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1248903916397 + ... + 1248903916404.

It is an arithmetic number, because the mean of its divisors is an integer number (2914109138269).

Almost surely, 2^{9991231331204} is an apocalyptic number.

It is an amenable number.

9991231331204 is a deficient number, since it is larger than the sum of its proper divisors (7493423498410).

9991231331204 is a wasteful number, since it uses less digits than its factorization.

9991231331204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2497807832805 (or 2497807832803 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 47.

The spelling of 9991231331204 in words is "nine trillion, nine hundred ninety-one billion, two hundred thirty-one million, three hundred thirty-one thousand, two hundred four".