1681441481 has 2 divisors, whose sum is σ = 1681441482. Its totient is φ = 1681441480.

The previous prime is 1681441477. The next prime is 1681441507. The reversal of 1681441481 is 1841441861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1163423881 + 518017600 = 34109^2 + 22760^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681441481 - 2² = 1681441477 is a prime.

It is a super-2 number, since 2×1681441481² = 5654490908054946722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1681491481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840720740 + 840720741.

It is an arithmetic number, because the mean of its divisors is an integer number (840720741).

Almost surely, 2^1681441481 is an apocalyptic number.

It is an amenable number.

1681441481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681441481 is an equidigital number, since it uses as much as digits as its factorization.

1681441481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24576, while the sum is 38.

The square root of 1681441481 is about 41005.3835611862. The cubic root of 1681441481 is about 1189.1242953620.

The spelling of 1681441481 in words is "one billion, six hundred eighty-one million, four hundred forty-one thousand, four hundred eighty-one".