2291121870 has 32 divisors (see below), whose sum is σ = 5519619072. Its totient is φ = 608640672.

The previous prime is 2291121787. The next prime is 2291121901. The reversal of 2291121870 is 781211922.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137302 + ... + 153081.

It is an arithmetic number, because the mean of its divisors is an integer number (172488096).

Almost surely, 2^2291121870 is an apocalyptic number.

2291121870 is an abundant number, since it is smaller than the sum of its proper divisors (3228497202).

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

2291121870 is a wasteful number, since it uses less digits than its factorization.

2291121870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290656.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 2291121870 is about 47865.6648339914. The cubic root of 2291121870 is about 1318.3054990022.

The spelling of 2291121870 in words is "two billion, two hundred ninety-one million, one hundred twenty-one thousand, eight hundred seventy".