2175720329 has 2 divisors, whose sum is σ = 2175720330. Its totient is φ = 2175720328.

The previous prime is 2175720311. The next prime is 2175720377. The reversal of 2175720329 is 9230275712.

It is a happy number.

2175720329 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1572281104 + 603439225 = 39652^2 + 24565^2 .

It is a cyclic number.

It is not a de Polignac number, because 2175720329 - 2¹² = 2175716233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2175720292 and 2175720301.

It is not a weakly prime, because it can be changed into another prime (2175620329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1087860164 + 1087860165.

It is an arithmetic number, because the mean of its divisors is an integer number (1087860165).

Almost surely, 2^2175720329 is an apocalyptic number.

It is an amenable number.

2175720329 is a deficient number, since it is larger than the sum of its proper divisors (1).

2175720329 is an equidigital number, since it uses as much as digits as its factorization.

2175720329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 2175720329 is about 46644.6173636359. The cubic root of 2175720329 is about 1295.7892018657.

The spelling of 2175720329 in words is "two billion, one hundred seventy-five million, seven hundred twenty thousand, three hundred twenty-nine".