1681312 has 12 divisors (see below), whose sum is σ = 3310146. Its totient is φ = 840640.

The previous prime is 1681307. The next prime is 1681321. The reversal of 1681312 is 2131861.

It can be written as a sum of positive squares in only one way, i.e., 913936 + 767376 = 956^2 + 876^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26239 + ... + 26302.

2^1681312 is an apocalyptic number.

It is an amenable number.

1681312 is a deficient number, since it is larger than the sum of its proper divisors (1628834).

1681312 is an equidigital number, since it uses as much as digits as its factorization.

1681312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52551 (or 52543 counting only the distinct ones).

The product of its digits is 288, while the sum is 22.

The square root of 1681312 is about 1296.6541558951. The cubic root of 1681312 is about 118.9093771363.

The spelling of 1681312 in words is "one million, six hundred eighty-one thousand, three hundred twelve".