991267152 has 40 divisors (see below), whose sum is σ = 2570326560. Its totient is φ = 329189760.

The previous prime is 991267117. The next prime is 991267169. The reversal of 991267152 is 251762199.

It is a super-2 number, since 2×991267152² = 1965221133268382208, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25474 + ... + 51297.

It is an arithmetic number, because the mean of its divisors is an integer number (64258164).

Almost surely, 2^991267152 is an apocalyptic number.

It is an amenable number.

991267152 is an abundant number, since it is smaller than the sum of its proper divisors (1579059408).

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

991267152 is a wasteful number, since it uses less digits than its factorization.

991267152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77051 (or 77045 counting only the distinct ones).

The product of its digits is 68040, while the sum is 42.

The square root of 991267152 is about 31484.3953729463. The cubic root of 991267152 is about 997.0805356893.

The spelling of 991267152 in words is "nine hundred ninety-one million, two hundred sixty-seven thousand, one hundred fifty-two".