2171725 has 6 divisors (see below), whose sum is σ = 2692970. Its totient is φ = 1737360.

The previous prime is 2171717. The next prime is 2171737. The reversal of 2171725 is 5271712.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 60516 + 2111209 = 246^2 + 1453^2 .

It is not a de Polignac number, because 2171725 - 2³ = 2171717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 86869 = 2171725 / (2 + 1 + 7 + 1 + 7 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 2171725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43410 + ... + 43459.

2^2171725 is an apocalyptic number.

2171725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2171725 is a deficient number, since it is larger than the sum of its proper divisors (521245).

2171725 is an equidigital number, since it uses as much as digits as its factorization.

2171725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86879 (or 86874 counting only the distinct ones).

The product of its digits is 980, while the sum is 25.

The square root of 2171725 is about 1473.6773731044. The cubic root of 2171725 is about 129.4995552625.

The spelling of 2171725 in words is "two million, one hundred seventy-one thousand, seven hundred twenty-five".