1991488334 has 16 divisors (see below), whose sum is σ = 3260373120. Its totient is φ = 904784760.

The previous prime is 1991488313. The next prime is 1991488339. The reversal of 1991488334 is 4338841991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1991488339) 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 in 7 ways as a sum of consecutive naturals, for example, 27167 + ... + 68709.

It is an arithmetic number, because the mean of its divisors is an integer number (203773320).

Almost surely, 2^1991488334 is an apocalyptic number.

1991488334 is a deficient number, since it is larger than the sum of its proper divisors (1268884786).

1991488334 is a wasteful number, since it uses less digits than its factorization.

1991488334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43735.

The product of its digits is 746496, while the sum is 50.

The square root of 1991488334 is about 44626.0947652828. The cubic root of 1991488334 is about 1258.1311704852.

The spelling of 1991488334 in words is "one billion, nine hundred ninety-one million, four hundred eighty-eight thousand, three hundred thirty-four".