991379608 has 8 divisors (see below), whose sum is σ = 1858836780. Its totient is φ = 495689800.

The previous prime is 991379581. The next prime is 991379621. The reversal of 991379608 is 806973199.

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 61961218 + ... + 61961233.

Almost surely, 2^991379608 is an apocalyptic number.

It is an amenable number.

991379608 is a deficient number, since it is larger than the sum of its proper divisors (867457172).

991379608 is a wasteful number, since it uses less digits than its factorization.

991379608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123922457 (or 123922453 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 991379608 is about 31486.1812228793. The cubic root of 991379608 is about 997.1182394333.

The spelling of 991379608 in words is "nine hundred ninety-one million, three hundred seventy-nine thousand, six hundred eight".