2173901869 has 2 divisors, whose sum is σ = 2173901870. Its totient is φ = 2173901868.

The previous prime is 2173901867. The next prime is 2173901941. The reversal of 2173901869 is 9681093712.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2009728900 + 164172969 = 44830^2 + 12813^2 .

It is a cyclic number.

It is not a de Polignac number, because 2173901869 - 2¹ = 2173901867 is a prime.

It is a super-2 number, since 2×2173901869² = 9451698672083386322, which contains 22 as substring.

Together with 2173901867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2173901861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086950934 + 1086950935.

It is an arithmetic number, because the mean of its divisors is an integer number (1086950935).

Almost surely, 2^2173901869 is an apocalyptic number.

It is an amenable number.

2173901869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2173901869 is an equidigital number, since it uses as much as digits as its factorization.

2173901869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 2173901869 is about 46625.1205789326. The cubic root of 2173901869 is about 1295.4280957714.

The spelling of 2173901869 in words is "two billion, one hundred seventy-three million, nine hundred one thousand, eight hundred sixty-nine".