2157125 has 8 divisors (see below), whose sum is σ = 2692248. Its totient is φ = 1725600.

The previous prime is 2157121. The next prime is 2157131. The reversal of 2157125 is 5217512.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 521284 + 1635841 = 722^2 + 1279^2 .

It is not a de Polignac number, because 2157125 - 2² = 2157121 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 1 + 5⁷ + 7⁶ + 1 + 2¹³ + 5⁹ .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2157125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8504 + ... + 8753.

It is an arithmetic number, because the mean of its divisors is an integer number (336531).

2^2157125 is an apocalyptic number.

2157125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2157125 is a deficient number, since it is larger than the sum of its proper divisors (535123).

2157125 is an equidigital number, since it uses as much as digits as its factorization.

2157125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17272 (or 17262 counting only the distinct ones).

The product of its digits is 700, while the sum is 23.

The square root of 2157125 is about 1468.7154251250. The cubic root of 2157125 is about 129.2087040882.

The spelling of 2157125 in words is "two million, one hundred fifty-seven thousand, one hundred twenty-five".