1681273733 has 2 divisors, whose sum is σ = 1681273734. Its totient is φ = 1681273732.

The previous prime is 1681273723. The next prime is 1681273739. The reversal of 1681273733 is 3373721861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1547478244 + 133795489 = 39338^2 + 11567^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681273733 - 2⁴ = 1681273717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681273739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840636866 + 840636867.

It is an arithmetic number, because the mean of its divisors is an integer number (840636867).

Almost surely, 2^1681273733 is an apocalyptic number.

It is an amenable number.

1681273733 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681273733 is an equidigital number, since it uses as much as digits as its factorization.

1681273733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 41.

The square root of 1681273733 is about 41003.3380714302. The cubic root of 1681273733 is about 1189.0847499564.

The spelling of 1681273733 in words is "one billion, six hundred eighty-one million, two hundred seventy-three thousand, seven hundred thirty-three".