2161973269 has 4 divisors (see below), whose sum is σ = 2162085696. Its totient is φ = 2161860844.

The previous prime is 2161973267. The next prime is 2161973279. The reversal of 2161973269 is 9623791612.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2161973269 - 2¹ = 2161973267 is a prime.

It is a super-2 number, since 2×2161973269² = 9348256831741092722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161973267) 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, 19279 + ... + 68524.

It is an arithmetic number, because the mean of its divisors is an integer number (540521424).

Almost surely, 2^2161973269 is an apocalyptic number.

It is an amenable number.

2161973269 is a deficient number, since it is larger than the sum of its proper divisors (112427).

2161973269 is an equidigital number, since it uses as much as digits as its factorization.

2161973269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112426.

The product of its digits is 244944, while the sum is 46.

The square root of 2161973269 is about 46497.0243026368. The cubic root of 2161973269 is about 1293.0543311726.

The spelling of 2161973269 in words is "two billion, one hundred sixty-one million, nine hundred seventy-three thousand, two hundred sixty-nine".