991310312 has 32 divisors (see below), whose sum is σ = 1920672000. Its totient is φ = 479164800.

The previous prime is 991310297. The next prime is 991310371. The reversal of 991310312 is 213013199.

991310312 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×991310312² = 1965392269355074688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 365939 + ... + 368637.

It is an arithmetic number, because the mean of its divisors is an integer number (60021000).

Almost surely, 2^991310312 is an apocalyptic number.

It is an amenable number.

991310312 is a deficient number, since it is larger than the sum of its proper divisors (929361688).

991310312 is a wasteful number, since it uses less digits than its factorization.

991310312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4217 (or 4213 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 991310312 is about 31485.0807843969. The cubic root of 991310312 is about 997.0950065179.

The spelling of 991310312 in words is "nine hundred ninety-one million, three hundred ten thousand, three hundred twelve".