1696889681 has 2 divisors, whose sum is σ = 1696889682. Its totient is φ = 1696889680.

The previous prime is 1696889657. The next prime is 1696889717. The reversal of 1696889681 is 1869886961.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1233133456 + 463756225 = 35116^2 + 21535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1696889681 is a prime.

It is a super-2 number, since 2×1696889681² = 5758869178968563522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1696889281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 848444840 + 848444841.

It is an arithmetic number, because the mean of its divisors is an integer number (848444841).

Almost surely, 2^1696889681 is an apocalyptic number.

It is an amenable number.

1696889681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1696889681 is an equidigital number, since it uses as much as digits as its factorization.

1696889681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8957952, while the sum is 62.

The square root of 1696889681 is about 41193.3208299598. The cubic root of 1696889681 is about 1192.7548821929.

The spelling of 1696889681 in words is "one billion, six hundred ninety-six million, eight hundred eighty-nine thousand, six hundred eighty-one".