1673681 has 2 divisors, whose sum is σ = 1673682. Its totient is φ = 1673680.

The previous prime is 1673669. The next prime is 1673713. The reversal of 1673681 is 1863761.

It is an a-pointer prime, because the next prime (1673713) can be obtained adding 1673681 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1500625 + 173056 = 1225^2 + 416^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1673681 is a prime.

It is a super-2 number, since 2×1673681² = 5602416179522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1673081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 836840 + 836841.

It is an arithmetic number, because the mean of its divisors is an integer number (836841).

2^1673681 is an apocalyptic number.

It is an amenable number.

1673681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1673681 is an equidigital number, since it uses as much as digits as its factorization.

1673681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 1673681 is about 1293.7082360409. The cubic root of 1673681 is about 118.7292055925.

The spelling of 1673681 in words is "one million, six hundred seventy-three thousand, six hundred eighty-one".