1681265 has 4 divisors (see below), whose sum is σ = 2017524. Its totient is φ = 1345008.

The previous prime is 1681261. The next prime is 1681271. The reversal of 1681265 is 5621861.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 295936 + 1385329 = 544^2 + 1177^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681265 - 2² = 1681261 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1681261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168122 + ... + 168131.

It is an arithmetic number, because the mean of its divisors is an integer number (504381).

2^1681265 is an apocalyptic number.

It is an amenable number.

1681265 is a deficient number, since it is larger than the sum of its proper divisors (336259).

1681265 is an equidigital number, since it uses as much as digits as its factorization.

1681265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336258.

The product of its digits is 2880, while the sum is 29.

The square root of 1681265 is about 1296.6360322002. The cubic root of 1681265 is about 118.9082691141.

The spelling of 1681265 in words is "one million, six hundred eighty-one thousand, two hundred sixty-five".