1991775714 has 16 divisors (see below), whose sum is σ = 3989324640. Its totient is φ = 662963040.

The previous prime is 1991775707. The next prime is 1991775739. The reversal of 1991775714 is 4175771991.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236059 + ... + 244350.

It is an arithmetic number, because the mean of its divisors is an integer number (249332790).

Almost surely, 2^1991775714 is an apocalyptic number.

1991775714 is an abundant number, since it is smaller than the sum of its proper divisors (1997548926).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1991775714 is a wasteful number, since it uses less digits than its factorization.

1991775714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481105.

The product of its digits is 555660, while the sum is 51.

The square root of 1991775714 is about 44629.3145141173. The cubic root of 1991775714 is about 1258.1916854176.

The spelling of 1991775714 in words is "one billion, nine hundred ninety-one million, seven hundred seventy-five thousand, seven hundred fourteen".