2191939134 has 96 divisors (see below), whose sum is σ = 5648755968. Its totient is φ = 550857600.

The previous prime is 2191939129. The next prime is 2191939151. The reversal of 2191939134 is 4319391912.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 441514 + ... + 446450.

It is an arithmetic number, because the mean of its divisors is an integer number (58841208).

Almost surely, 2^2191939134 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2191939134, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2824377984).

2191939134 is an abundant number, since it is smaller than the sum of its proper divisors (3456816834).

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

2191939134 is a wasteful number, since it uses less digits than its factorization.

2191939134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5022 (or 4991 counting only the distinct ones).

The product of its digits is 52488, while the sum is 42.

The square root of 2191939134 is about 46818.1496217012. The cubic root of 2191939134 is about 1299.0010341339.

The spelling of 2191939134 in words is "two billion, one hundred ninety-one million, nine hundred thirty-nine thousand, one hundred thirty-four".