991143230 has 32 divisors (see below), whose sum is σ = 2224281600. Its totient is φ = 308927520.

The previous prime is 991143229. The next prime is 991143239. The reversal of 991143230 is 32341199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991143239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 642830 + ... + 644369.

It is an arithmetic number, because the mean of its divisors is an integer number (69508800).

Almost surely, 2^991143230 is an apocalyptic number.

991143230 is an abundant number, since it is smaller than the sum of its proper divisors (1233138370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991143230 is a wasteful number, since it uses less digits than its factorization.

991143230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287224.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 991143230 is about 31482.4273206498. The cubic root of 991143230 is about 997.0389843735.

The spelling of 991143230 in words is "nine hundred ninety-one million, one hundred forty-three thousand, two hundred thirty".