1681265693 has 2 divisors, whose sum is σ = 1681265694. Its totient is φ = 1681265692.

The previous prime is 1681265671. The next prime is 1681265699. The reversal of 1681265693 is 3965621861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1052158969 + 629106724 = 32437^2 + 25082^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681265693 - 2²⁴ = 1664488477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681265699) 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, 840632846 + 840632847.

It is an arithmetic number, because the mean of its divisors is an integer number (840632847).

Almost surely, 2^1681265693 is an apocalyptic number.

It is an amenable number.

1681265693 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681265693 is an equidigital number, since it uses as much as digits as its factorization.

1681265693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 47.

The square root of 1681265693 is about 41003.2400305147. The cubic root of 1681265693 is about 1189.0828545171.

The spelling of 1681265693 in words is "one billion, six hundred eighty-one million, two hundred sixty-five thousand, six hundred ninety-three".