2191694734 has 4 divisors (see below), whose sum is σ = 3287542104. Its totient is φ = 1095847366.

The previous prime is 2191694717. The next prime is 2191694737. The reversal of 2191694734 is 4374961912.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191694737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 547923682 + ... + 547923685.

It is an arithmetic number, because the mean of its divisors is an integer number (821885526).

Almost surely, 2^2191694734 is an apocalyptic number.

2191694734 is a deficient number, since it is larger than the sum of its proper divisors (1095847370).

2191694734 is a wasteful number, since it uses less digits than its factorization.

2191694734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095847369.

The product of its digits is 326592, while the sum is 46.

The square root of 2191694734 is about 46815.5394500587. The cubic root of 2191694734 is about 1298.9527530407.

The spelling of 2191694734 in words is "two billion, one hundred ninety-one million, six hundred ninety-four thousand, seven hundred thirty-four".