2172501 has 10 divisors (see below), whose sum is σ = 3245462. Its totient is φ = 1448280.

The previous prime is 2172497. The next prime is 2172539. The reversal of 2172501 is 1052712.

It can be written as a sum of positive squares in only one way, i.e., 2099601 + 72900 = 1449^2 + 270^2 .

It is not a de Polignac number, because 2172501 - 2² = 2172497 is a prime.

It is a Duffinian number.

2172501 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172551) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 13330 + ... + 13491.

2^2172501 is an apocalyptic number.

It is an amenable number.

2172501 is a deficient number, since it is larger than the sum of its proper divisors (1072961).

2172501 is an equidigital number, since it uses as much as digits as its factorization.

2172501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26833 (or 26824 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 2172501 is about 1473.9406365251. The cubic root of 2172501 is about 129.5149776707.

The spelling of 2172501 in words is "two million, one hundred seventy-two thousand, five hundred one".