2131625 has 8 divisors (see below), whose sum is σ = 2660424. Its totient is φ = 1705200.

The previous prime is 2131609. The next prime is 2131627. The reversal of 2131625 is 5261312.

It can be written as a sum of positive squares in 4 ways, for example, as 163216 + 1968409 = 404^2 + 1403^2 .

It is not a de Polignac number, because 2131625 - 2⁴ = 2131609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2131597 and 2131606.

It is not an unprimeable number, because it can be changed into a prime (2131627) 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, 8402 + ... + 8651.

It is an arithmetic number, because the mean of its divisors is an integer number (332553).

2^2131625 is an apocalyptic number.

2131625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2131625 is a deficient number, since it is larger than the sum of its proper divisors (528799).

2131625 is an equidigital number, since it uses as much as digits as its factorization.

2131625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17068 (or 17058 counting only the distinct ones).

The product of its digits is 360, while the sum is 20.

The square root of 2131625 is about 1460.0085616187. The cubic root of 2131625 is about 128.6975467358.

Adding to 2131625 its reverse (5261312), we get a palindrome (7392937).

It can be divided in two parts, 21316 and 25, that multiplied together give a square (532900 = 730²).

The spelling of 2131625 in words is "two million, one hundred thirty-one thousand, six hundred twenty-five".