2291121871 has 8 divisors (see below), whose sum is σ = 2309323280. Its totient is φ = 2272992192.

The previous prime is 2291121787. The next prime is 2291121901. The reversal of 2291121871 is 1781211922.

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

It is a cyclic number.

It is not a de Polignac number, because 2291121871 - 2⁹ = 2291121359 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 (2291121271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47131 + ... + 82483.

It is an arithmetic number, because the mean of its divisors is an integer number (288665410).

Almost surely, 2^2291121871 is an apocalyptic number.

2291121871 is a deficient number, since it is larger than the sum of its proper divisors (18201409).

2291121871 is a wasteful number, since it uses less digits than its factorization.

2291121871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35865.

The product of its digits is 4032, while the sum is 34.

The square root of 2291121871 is about 47865.6648444373. The cubic root of 2291121871 is about 1318.3054991940.

The spelling of 2291121871 in words is "two billion, two hundred ninety-one million, one hundred twenty-one thousand, eight hundred seventy-one".