2171917439 has 4 divisors (see below), whose sum is σ = 2266348656. Its totient is φ = 2077486224.

The previous prime is 2171917421. The next prime is 2171917441. The reversal of 2171917439 is 9347191712.

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

It is not a de Polignac number, because 2171917439 - 2⁸ = 2171917183 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2171917439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171917639) 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 3 ways as a sum of consecutive naturals, for example, 47215574 + ... + 47215619.

It is an arithmetic number, because the mean of its divisors is an integer number (566587164).

Almost surely, 2^2171917439 is an apocalyptic number.

2171917439 is a deficient number, since it is larger than the sum of its proper divisors (94431217).

2171917439 is an equidigital number, since it uses as much as digits as its factorization.

2171917439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94431216.

The product of its digits is 95256, while the sum is 44.

The square root of 2171917439 is about 46603.8350245986. The cubic root of 2171917439 is about 1295.0338018338.

The spelling of 2171917439 in words is "two billion, one hundred seventy-one million, nine hundred seventeen thousand, four hundred thirty-nine".