1991144412014 has 16 divisors (see below), whose sum is σ = 3059630945280. Its totient is φ = 971268503040.

The previous prime is 1991144411951. The next prime is 1991144412029. The reversal of 1991144412014 is 4102144411991.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Curzon number.

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, 3850142 + ... + 4336574.

It is an arithmetic number, because the mean of its divisors is an integer number (191226934080).

Almost surely, 2^{1991144412014} is an apocalyptic number.

1991144412014 is a deficient number, since it is larger than the sum of its proper divisors (1068486533266).

1991144412014 is a wasteful number, since it uses less digits than its factorization.

1991144412014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536395.

The product of its (nonzero) digits is 41472, while the sum is 41.

The spelling of 1991144412014 in words is "one trillion, nine hundred ninety-one billion, one hundred forty-four million, four hundred twelve thousand, fourteen".