2171530505 has 4 divisors (see below), whose sum is σ = 2605836612. Its totient is φ = 1737224400.

The previous prime is 2171530483. The next prime is 2171530507. The reversal of 2171530505 is 5050351712.

It is a happy number.

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 229189321 + 1942341184 = 15139^2 + 44072^2 .

It is not a de Polignac number, because 2171530505 - 2¹⁸ = 2171268361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2171530507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217153046 + ... + 217153055.

It is an arithmetic number, because the mean of its divisors is an integer number (651459153).

Almost surely, 2^2171530505 is an apocalyptic number.

It is an amenable number.

2171530505 is a deficient number, since it is larger than the sum of its proper divisors (434306107).

2171530505 is an equidigital number, since it uses as much as digits as its factorization.

2171530505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434306106.

The product of its (nonzero) digits is 5250, while the sum is 29.

The square root of 2171530505 is about 46599.6835289683. The cubic root of 2171530505 is about 1294.9568924695.

The spelling of 2171530505 in words is "two billion, one hundred seventy-one million, five hundred thirty thousand, five hundred five".