1681525 has 6 divisors (see below), whose sum is σ = 2085122. Its totient is φ = 1345200.

The previous prime is 1681517. The next prime is 1681541. The reversal of 1681525 is 5251861.

It can be written as a sum of positive squares in 3 ways, for example, as 224676 + 1456849 = 474^2 + 1207^2 .

It is not a de Polignac number, because 1681525 - 2³ = 1681517 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 1681493 and 1681502.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 33606 + ... + 33655.

2^1681525 is an apocalyptic number.

It is an amenable number.

1681525 is a deficient number, since it is larger than the sum of its proper divisors (403597).

1681525 is an equidigital number, since it uses as much as digits as its factorization.

1681525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67271 (or 67266 counting only the distinct ones).

The product of its digits is 2400, while the sum is 28.

The square root of 1681525 is about 1296.7362877625. The cubic root of 1681525 is about 118.9143983395.

The spelling of 1681525 in words is "one million, six hundred eighty-one thousand, five hundred twenty-five".