2131425 has 18 divisors (see below), whose sum is σ = 3818022. Its totient is φ = 1136640.

The previous prime is 2131417. The next prime is 2131427. The reversal of 2131425 is 5241312.

It can be written as a sum of positive squares in 3 ways, for example, as 603729 + 1527696 = 777^2 + 1236^2 .

It is not a de Polignac number, because 2131425 - 2³ = 2131417 is a prime.

It is a Curzon number.

2131425 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2131398 and 2131407.

It is not an unprimeable number, because it can be changed into a prime (2131427) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4512 + ... + 4961.

2^2131425 is an apocalyptic number.

2131425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2131425 is a deficient number, since it is larger than the sum of its proper divisors (1686597).

2131425 is a wasteful number, since it uses less digits than its factorization.

2131425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9489 (or 9481 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 2131425 is about 1459.9400672630. The cubic root of 2131425 is about 128.6935215884.

Adding to 2131425 its reverse (5241312), we get a palindrome (7372737).

It can be divided in two parts, 2131 and 425, that added together give a triangular number (2556 = T₇₁).

The spelling of 2131425 in words is "two million, one hundred thirty-one thousand, four hundred twenty-five".