991194930 has 96 divisors (see below), whose sum is σ = 2902169088. Its totient is φ = 232531200.

The previous prime is 991194929. The next prime is 991194931. The reversal of 991194930 is 39491199.

It is an interprime number because it is at equal distance from previous prime (991194929) and next prime (991194931).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (991194931) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14542 + ... + 46838.

It is an arithmetic number, because the mean of its divisors is an integer number (30230928).

Almost surely, 2^991194930 is an apocalyptic number.

991194930 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 991194930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1451084544).

991194930 is an abundant number, since it is smaller than the sum of its proper divisors (1910974158).

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

991194930 is a wasteful number, since it uses less digits than its factorization.

991194930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32352 (or 32349 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 45.

The square root of 991194930 is about 31483.2484029206. The cubic root of 991194930 is about 997.0563199168.

The spelling of 991194930 in words is "nine hundred ninety-one million, one hundred ninety-four thousand, nine hundred thirty".