1681101689 has 2 divisors, whose sum is σ = 1681101690. Its totient is φ = 1681101688.

The previous prime is 1681101629. The next prime is 1681101701. The reversal of 1681101689 is 9861011861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1638630400 + 42471289 = 40480^2 + 6517^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681101689 - 2²⁰ = 1680053113 is a prime.

It is a super-2 number, since 2×1681101689² = 5652205777517305442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1681101629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840550844 + 840550845.

It is an arithmetic number, because the mean of its divisors is an integer number (840550845).

Almost surely, 2^1681101689 is an apocalyptic number.

It is an amenable number.

1681101689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681101689 is an equidigital number, since it uses as much as digits as its factorization.

1681101689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 41.

The square root of 1681101689 is about 41001.2400910021. The cubic root of 1681101689 is about 1189.0441890667.

The spelling of 1681101689 in words is "one billion, six hundred eighty-one million, one hundred one thousand, six hundred eighty-nine".