2261720267 has 4 divisors (see below), whose sum is σ = 2279529216. Its totient is φ = 2243911320.

The previous prime is 2261720257. The next prime is 2261720297. The reversal of 2261720267 is 7620271622.

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 2261720267 - 2²⁰ = 2260671691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2261720207) 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, 8904284 + ... + 8904537.

It is an arithmetic number, because the mean of its divisors is an integer number (569882304).

Almost surely, 2^2261720267 is an apocalyptic number.

2261720267 is a deficient number, since it is larger than the sum of its proper divisors (17808949).

2261720267 is a wasteful number, since it uses less digits than its factorization.

2261720267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17808948.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 2261720267 is about 47557.5468984682. The cubic root of 2261720267 is about 1312.6420015310.

Adding to 2261720267 its reverse (7620271622), we get a palindrome (9881991889).

The spelling of 2261720267 in words is "two billion, two hundred sixty-one million, seven hundred twenty thousand, two hundred sixty-seven".