1689911161 has 2 divisors, whose sum is σ = 1689911162. Its totient is φ = 1689911160.

The previous prime is 1689911159. The next prime is 1689911203. The reversal of 1689911161 is 1611199861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1061456400 + 628454761 = 32580^2 + 25069^2 .

It is an emirp because it is prime and its reverse (1611199861) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1911166891 and 1986611191.

It is a cyclic number.

It is not a de Polignac number, because 1689911161 - 2¹ = 1689911159 is a prime.

Together with 1689911159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1609911161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844955580 + 844955581.

It is an arithmetic number, because the mean of its divisors is an integer number (844955581).

Almost surely, 2^1689911161 is an apocalyptic number.

It is an amenable number.

1689911161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689911161 is an equidigital number, since it uses as much as digits as its factorization.

1689911161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 43.

The square root of 1689911161 is about 41108.5290541999. The cubic root of 1689911161 is about 1191.1175531253.

The spelling of 1689911161 in words is "one billion, six hundred eighty-nine million, nine hundred eleven thousand, one hundred sixty-one".