2143920869 has 4 divisors (see below), whose sum is σ = 2166023244. Its totient is φ = 2121818496.

The previous prime is 2143920833. The next prime is 2143920887. The reversal of 2143920869 is 9680293412.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1516167844 + 627753025 = 38938^2 + 25055^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143920869 - 2¹⁶ = 2143855333 is a prime.

It is a super-2 number, since 2×2143920869² = 9192793385067430322, 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 (2143920829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11051042 + ... + 11051235.

It is an arithmetic number, because the mean of its divisors is an integer number (541505811).

Almost surely, 2^2143920869 is an apocalyptic number.

It is an amenable number.

2143920869 is a deficient number, since it is larger than the sum of its proper divisors (22102375).

2143920869 is an equidigital number, since it uses as much as digits as its factorization.

2143920869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22102374.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 2143920869 is about 46302.4931186216. The cubic root of 2143920869 is about 1289.4452813978.

The spelling of 2143920869 in words is "two billion, one hundred forty-three million, nine hundred twenty thousand, eight hundred sixty-nine".