991064894 has 8 divisors (see below), whose sum is σ = 1551232080. Its totient is φ = 473987536.

The previous prime is 991064873. The next prime is 991064959. The reversal of 991064894 is 498460199.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10772399 + ... + 10772490.

It is an arithmetic number, because the mean of its divisors is an integer number (193904010).

Almost surely, 2^991064894 is an apocalyptic number.

991064894 is a deficient number, since it is larger than the sum of its proper divisors (560167186).

991064894 is a wasteful number, since it uses less digits than its factorization.

991064894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21544914.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 991064894 is about 31481.1831734451. The cubic root of 991064894 is about 997.0127163558.

The spelling of 991064894 in words is "nine hundred ninety-one million, sixty-four thousand, eight hundred ninety-four".