2171917593 has 6 divisors (see below), whose sum is σ = 3137214314. Its totient is φ = 1447945056.

The previous prime is 2171917571. The next prime is 2171917597. The reversal of 2171917593 is 3957191712.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2123642889 + 48274704 = 46083^2 + 6948^2 .

It is not a de Polignac number, because 2171917593 - 2⁸ = 2171917337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2171917597) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 120662080 + ... + 120662097.

Almost surely, 2^2171917593 is an apocalyptic number.

It is an amenable number.

2171917593 is a deficient number, since it is larger than the sum of its proper divisors (965296721).

2171917593 is a wasteful number, since it uses less digits than its factorization.

2171917593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241324183 (or 241324180 counting only the distinct ones).

The product of its digits is 119070, while the sum is 45.

The square root of 2171917593 is about 46603.8366768231. The cubic root of 2171917593 is about 1295.0338324420.

The spelling of 2171917593 in words is "two billion, one hundred seventy-one million, nine hundred seventeen thousand, five hundred ninety-three".