2171854289 has 18 divisors (see below), whose sum is σ = 2407131090. Its totient is φ = 1958098560.

The previous prime is 2171854249. The next prime is 2171854331. The reversal of 2171854289 is 9824581712.

It can be written as a sum of positive squares in only one way, i.e., 1236717889 + 935136400 = 35167^2 + 30580^2 .

It is not a de Polignac number, because 2171854289 - 2²⁰ = 2170805713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2171854249) 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 17 ways as a sum of consecutive naturals, for example, 2337377 + ... + 2338305.

It is an arithmetic number, because the mean of its divisors is an integer number (133729505).

Almost surely, 2^2171854289 is an apocalyptic number.

It is an amenable number.

2171854289 is a deficient number, since it is larger than the sum of its proper divisors (235276801).

2171854289 is an equidigital number, since it uses as much as digits as its factorization.

2171854289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229 (or 1079 counting only the distinct ones).

The product of its digits is 322560, while the sum is 47.

The square root of 2171854289 is about 46603.1575003239. The cubic root of 2171854289 is about 1295.0212503780.

The spelling of 2171854289 in words is "two billion, one hundred seventy-one million, eight hundred fifty-four thousand, two hundred eighty-nine".