991099152 has 200 divisors, whose sum is σ = 2994558336. Its totient is φ = 316203264.

The previous prime is 991099127. The next prime is 991099159. The reversal of 991099152 is 251990199.

It is a junction number, because it is equal to n+sod(n) for n = 991099098 and 991099107.

It is not an unprimeable number, because it can be changed into a prime (991099159) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3228183 + ... + 3228489.

Almost surely, 2^991099152 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 991099152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1497279168).

991099152 is an abundant number, since it is smaller than the sum of its proper divisors (2003459184).

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

991099152 is a wasteful number, since it uses less digits than its factorization.

991099152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 65610, while the sum is 45.

The square root of 991099152 is about 31481.7272715459. The cubic root of 991099152 is about 997.0242040893.

The spelling of 991099152 in words is "nine hundred ninety-one million, ninety-nine thousand, one hundred fifty-two".