2781194091 has 8 divisors (see below), whose sum is σ = 3993509520. Its totient is φ = 1711504032.

The previous prime is 2781194023. The next prime is 2781194113. The reversal of 2781194091 is 1904911872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2781194091 - 2⁹ = 2781193579 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2781154091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35656296 + ... + 35656373.

It is an arithmetic number, because the mean of its divisors is an integer number (499188690).

Almost surely, 2^2781194091 is an apocalyptic number.

2781194091 is a deficient number, since it is larger than the sum of its proper divisors (1212315429).

2781194091 is a wasteful number, since it uses less digits than its factorization.

2781194091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71312685.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 2781194091 is about 52737.0277035026. The cubic root of 2781194091 is about 1406.2971587780.

The spelling of 2781194091 in words is "two billion, seven hundred eighty-one million, one hundred ninety-four thousand, ninety-one".