991143192 has 64 divisors (see below), whose sum is σ = 2705078880. Its totient is φ = 300782592.

The previous prime is 991143169. The next prime is 991143221. The reversal of 991143192 is 291341199.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 991143192.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1018 + ... + 44534.

Almost surely, 2^991143192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991143192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1352539440).

991143192 is an abundant number, since it is smaller than the sum of its proper divisors (1713935688).

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

991143192 is a wasteful number, since it uses less digits than its factorization.

991143192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43612 (or 43608 counting only the distinct ones).

The product of its digits is 17496, while the sum is 39.

The square root of 991143192 is about 31482.4267171386. The cubic root of 991143192 is about 997.0389716315.

The spelling of 991143192 in words is "nine hundred ninety-one million, one hundred forty-three thousand, one hundred ninety-two".