991912892 has 6 divisors (see below), whose sum is σ = 1735847568. Its totient is φ = 495956444.

The previous prime is 991912891. The next prime is 991912903. The reversal of 991912892 is 298219199.

It is a self number, because there is not a number n which added to its sum of digits gives 991912892.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991912891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123989108 + ... + 123989115.

It is an arithmetic number, because the mean of its divisors is an integer number (289307928).

Almost surely, 2^991912892 is an apocalyptic number.

It is an amenable number.

991912892 is a deficient number, since it is larger than the sum of its proper divisors (743934676).

991912892 is a wasteful number, since it uses less digits than its factorization.

991912892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247978227 (or 247978225 counting only the distinct ones).

The product of its digits is 209952, while the sum is 50.

The square root of 991912892 is about 31494.6486248061. The cubic root of 991912892 is about 997.2969976948.

The spelling of 991912892 in words is "nine hundred ninety-one million, nine hundred twelve thousand, eight hundred ninety-two".