991152644 has 24 divisors (see below), whose sum is σ = 1785302400. Its totient is φ = 481272480.

The previous prime is 991152601. The next prime is 991152647. The reversal of 991152644 is 446251199.

It is not an unprimeable number, because it can be changed into a prime (991152647) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 6434 + ... + 44985.

It is an arithmetic number, because the mean of its divisors is an integer number (74387600).

Almost surely, 2^991152644 is an apocalyptic number.

It is an amenable number.

991152644 is a deficient number, since it is larger than the sum of its proper divisors (794149756).

991152644 is a wasteful number, since it uses less digits than its factorization.

991152644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51563 (or 51561 counting only the distinct ones).

The product of its digits is 77760, while the sum is 41.

The square root of 991152644 is about 31482.5768322734. The cubic root of 991152644 is about 997.0421410297.

The spelling of 991152644 in words is "nine hundred ninety-one million, one hundred fifty-two thousand, six hundred forty-four".