2171502409 has 2 divisors, whose sum is σ = 2171502410. Its totient is φ = 2171502408.

The previous prime is 2171502407. The next prime is 2171502433. The reversal of 2171502409 is 9042051712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2118576784 + 52925625 = 46028^2 + 7275^2 .

It is a cyclic number.

It is not a de Polignac number, because 2171502409 - 2¹ = 2171502407 is a prime.

Together with 2171502407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2171502407) 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 as a sum of consecutive naturals, namely, 1085751204 + 1085751205.

It is an arithmetic number, because the mean of its divisors is an integer number (1085751205).

Almost surely, 2^2171502409 is an apocalyptic number.

It is an amenable number.

2171502409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171502409 is an equidigital number, since it uses as much as digits as its factorization.

2171502409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 2171502409 is about 46599.3820667184. The cubic root of 2171502409 is about 1294.9513075812.

The spelling of 2171502409 in words is "two billion, one hundred seventy-one million, five hundred two thousand, four hundred nine".