2269891681 has 4 divisors (see below), whose sum is σ = 2289979332. Its totient is φ = 2249804032.

The previous prime is 2269891667. The next prime is 2269891693. The reversal of 2269891681 is 1861989622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1861989622 = 2 ⋅930994811.

It can be written as a sum of positive squares in 2 ways, for example, as 22278400 + 2247613281 = 4720^2 + 47409^2 .

It is a cyclic number.

It is not a de Polignac number, because 2269891681 - 2¹⁷ = 2269760609 is a prime.

It is a super-2 number, since 2×2269891681² = 10304816486946011522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2269891081) 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, 10043656 + ... + 10043881.

It is an arithmetic number, because the mean of its divisors is an integer number (572494833).

Almost surely, 2^2269891681 is an apocalyptic number.

It is an amenable number.

2269891681 is a deficient number, since it is larger than the sum of its proper divisors (20087651).

2269891681 is a wasteful number, since it uses less digits than its factorization.

2269891681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20087650.

The product of its digits is 746496, while the sum is 52.

The square root of 2269891681 is about 47643.3802432195. The cubic root of 2269891681 is about 1314.2209249855.

The spelling of 2269891681 in words is "two billion, two hundred sixty-nine million, eight hundred ninety-one thousand, six hundred eighty-one".