2291691407 has 4 divisors (see below), whose sum is σ = 2344986600. Its totient is φ = 2238396216.

The previous prime is 2291691397. The next prime is 2291691449. The reversal of 2291691407 is 7041961922.

2291691407 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2291691407 - 2²⁶ = 2224582543 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 (2291691907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26647532 + ... + 26647617.

It is an arithmetic number, because the mean of its divisors is an integer number (586246650).

Almost surely, 2^2291691407 is an apocalyptic number.

2291691407 is a deficient number, since it is larger than the sum of its proper divisors (53295193).

2291691407 is an equidigital number, since it uses as much as digits as its factorization.

2291691407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53295192.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 2291691407 is about 47871.6137914735. The cubic root of 2291691407 is about 1318.4147266493.

The spelling of 2291691407 in words is "two billion, two hundred ninety-one million, six hundred ninety-one thousand, four hundred seven".