2145625 has 10 divisors (see below), whose sum is σ = 2681954. Its totient is φ = 1716000.

The previous prime is 2145617. The next prime is 2145629. The reversal of 2145625 is 5265412.

2145625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 5 ways, for example, as 1024144 + 1121481 = 1012^2 + 1059^2 .

It is not a de Polignac number, because 2145625 - 2³ = 2145617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

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 2145625.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1092 + ... + 2341.

2^2145625 is an apocalyptic number.

2145625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2145625 is a deficient number, since it is larger than the sum of its proper divisors (536329).

2145625 is an frugal number, since it uses more digits than its factorization.

2145625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3453 (or 3438 counting only the distinct ones).

The product of its digits is 2400, while the sum is 25.

The square root of 2145625 is about 1464.7952075290. The cubic root of 2145625 is about 128.9786836561.

The spelling of 2145625 in words is "two million, one hundred forty-five thousand, six hundred twenty-five".