2171249 has 2 divisors, whose sum is σ = 2171250. Its totient is φ = 2171248.

The previous prime is 2171243. The next prime is 2171261. The reversal of 2171249 is 9421712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2122849 + 48400 = 1457^2 + 220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2171249 is a prime.

It is not a weakly prime, because it can be changed into another prime (2171243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085624 + 1085625.

It is an arithmetic number, because the mean of its divisors is an integer number (1085625).

2^2171249 is an apocalyptic number.

It is an amenable number.

2171249 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171249 is an equidigital number, since it uses as much as digits as its factorization.

2171249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 26.

The square root of 2171249 is about 1473.5158635047. The cubic root of 2171249 is about 129.4900933075.

The spelling of 2171249 in words is "two million, one hundred seventy-one thousand, two hundred forty-nine".