2171565 has 48 divisors (see below), whose sum is σ = 4245696. Its totient is φ = 1017600.

The previous prime is 2171557. The next prime is 2171579. The reversal of 2171565 is 5651712.

It is not a de Polignac number, because 2171565 - 2³ = 2171557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20242 + ... + 20348.

It is an arithmetic number, because the mean of its divisors is an integer number (88452).

2^2171565 is an apocalyptic number.

It is an amenable number.

2171565 is a deficient number, since it is larger than the sum of its proper divisors (2074131).

2171565 is a wasteful number, since it uses less digits than its factorization.

2171565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 167 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 2171565 is about 1473.6230861384. The cubic root of 2171565 is about 129.4963749277.

The spelling of 2171565 in words is "two million, one hundred seventy-one thousand, five hundred sixty-five".