1991354014 has 16 divisors (see below), whose sum is σ = 3386108880. Its totient is φ = 870713280.

The previous prime is 1991354009. The next prime is 1991354039. The reversal of 1991354014 is 4104531991.

It is a congruent number.

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, 2015047 + ... + 2016034.

It is an arithmetic number, because the mean of its divisors is an integer number (211631805).

Almost surely, 2^1991354014 is an apocalyptic number.

1991354014 is a deficient number, since it is larger than the sum of its proper divisors (1394754866).

1991354014 is a wasteful number, since it uses less digits than its factorization.

1991354014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4031115.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 1991354014 is about 44624.5897908317. The cubic root of 1991354014 is about 1258.1028841068.

The spelling of 1991354014 in words is "one billion, nine hundred ninety-one million, three hundred fifty-four thousand, fourteen".