2291279809 has 16 divisors (see below), whose sum is σ = 2867840640. Its totient is φ = 1782149760.

The previous prime is 2291279807. The next prime is 2291279857. The reversal of 2291279809 is 9089721922.

It is a cyclic number.

It is not a de Polignac number, because 2291279809 - 2¹ = 2291279807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2291279801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 208012 + ... + 218749.

It is an arithmetic number, because the mean of its divisors is an integer number (179240040).

Almost surely, 2^2291279809 is an apocalyptic number.

It is an amenable number.

2291279809 is a deficient number, since it is larger than the sum of its proper divisors (576560831).

2291279809 is a wasteful number, since it uses less digits than its factorization.

2291279809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426840.

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 2291279809 is about 47867.3146207305. The cubic root of 2291279809 is about 1318.3357908679.

The spelling of 2291279809 in words is "two billion, two hundred ninety-one million, two hundred seventy-nine thousand, eight hundred nine".