991082912 has 12 divisors (see below), whose sum is σ = 1951194546. Its totient is φ = 495541440.

The previous prime is 991082891. The next prime is 991082923. The reversal of 991082912 is 219280199.

It can be written as a sum of positive squares in only one way, i.e., 503733136 + 487349776 = 22444^2 + 22076^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 991082912.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15485639 + ... + 15485702.

Almost surely, 2^991082912 is an apocalyptic number.

It is an amenable number.

991082912 is a deficient number, since it is larger than the sum of its proper divisors (960111634).

991082912 is a wasteful number, since it uses less digits than its factorization.

991082912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30971351 (or 30971343 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 991082912 is about 31481.4693430913. The cubic root of 991082912 is about 997.0187583639.

The spelling of 991082912 in words is "nine hundred ninety-one million, eighty-two thousand, nine hundred twelve".