2195161591 has 4 divisors (see below), whose sum is σ = 2508756112. Its totient is φ = 1881567072.

The previous prime is 2195161571. The next prime is 2195161613. The reversal of 2195161591 is 1951615912.

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

It is not a de Polignac number, because 2195161591 - 2⁵ = 2195161559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2195161511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156797250 + ... + 156797263.

It is an arithmetic number, because the mean of its divisors is an integer number (627189028).

Almost surely, 2^2195161591 is an apocalyptic number.

2195161591 is a deficient number, since it is larger than the sum of its proper divisors (313594521).

2195161591 is an equidigital number, since it uses as much as digits as its factorization.

2195161591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313594520.

The product of its digits is 24300, while the sum is 40.

The square root of 2195161591 is about 46852.5515954041. The cubic root of 2195161591 is about 1299.6372934870.

The spelling of 2195161591 in words is "two billion, one hundred ninety-five million, one hundred sixty-one thousand, five hundred ninety-one".