2191156434 has 40 divisors (see below), whose sum is σ = 4919644620. Its totient is φ = 728923104.

The previous prime is 2191156427. The next prime is 2191156439. The reversal of 2191156434 is 4346511912.

It is a happy number.

2191156434 is a `hidden beast` number, since 2 + 1 + 9 + 1 + 1 + 5 + 643 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1593207225 + 597949209 = 39915^2 + 24453^2 .

It is not an unprimeable number, because it can be changed into a prime (2191156439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 69172 + ... + 95744.

Almost surely, 2^2191156434 is an apocalyptic number.

2191156434 is an abundant number, since it is smaller than the sum of its proper divisors (2728488186).

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

2191156434 is a wasteful number, since it uses less digits than its factorization.

2191156434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27096 (or 27087 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 2191156434 is about 46809.7899375761. The cubic root of 2191156434 is about 1298.8463994947.

The spelling of 2191156434 in words is "two billion, one hundred ninety-one million, one hundred fifty-six thousand, four hundred thirty-four".