2191317738 has 16 divisors (see below), whose sum is σ = 4411661376. Its totient is φ = 725601600.

The previous prime is 2191317727. The next prime is 2191317743. The reversal of 2191317738 is 8377131912.

2191317738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 2191317738.

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, 1208431 + ... + 1210242.

It is an arithmetic number, because the mean of its divisors is an integer number (275728836).

Almost surely, 2^2191317738 is an apocalyptic number.

2191317738 is an abundant number, since it is smaller than the sum of its proper divisors (2220343638).

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

2191317738 is a wasteful number, since it uses less digits than its factorization.

2191317738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2418829.

The product of its digits is 63504, while the sum is 42.

The square root of 2191317738 is about 46811.5128787780. The cubic root of 2191317738 is about 1298.8782706375.

The spelling of 2191317738 in words is "two billion, one hundred ninety-one million, three hundred seventeen thousand, seven hundred thirty-eight".