1681281 has 12 divisors (see below), whose sum is σ = 2775552. Its totient is φ = 960696.

The previous prime is 1681279. The next prime is 1681289. The reversal of 1681281 is 1821861.

It is not a de Polignac number, because 1681281 - 2¹ = 1681279 is a prime.

It is a super-2 number, since 2×1681281² = 5653411601922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13281 + ... + 13406.

It is an arithmetic number, because the mean of its divisors is an integer number (231296).

2^1681281 is an apocalyptic number.

It is an amenable number.

1681281 is a deficient number, since it is larger than the sum of its proper divisors (1094271).

1681281 is a wasteful number, since it uses less digits than its factorization.

1681281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26700 (or 26697 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 1681281 is about 1296.6422019971. The cubic root of 1681281 is about 118.9086463155.

The spelling of 1681281 in words is "one million, six hundred eighty-one thousand, two hundred eighty-one".