1686161369 has 2 divisors, whose sum is σ = 1686161370. Its totient is φ = 1686161368.

The previous prime is 1686161353. The next prime is 1686161383. The reversal of 1686161369 is 9631616861.

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., 961744144 + 724417225 = 31012^2 + 26915^2 .

It is a cyclic number.

It is not a de Polignac number, because 1686161369 - 2⁴ = 1686161353 is a prime.

It is a super-2 number, since 2×1686161369² = 5686280324615908322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1683161369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843080684 + 843080685.

It is an arithmetic number, because the mean of its divisors is an integer number (843080685).

Almost surely, 2^1686161369 is an apocalyptic number.

It is an amenable number.

1686161369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1686161369 is an equidigital number, since it uses as much as digits as its factorization.

1686161369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 47.

The square root of 1686161369 is about 41062.8952827245. The cubic root of 1686161369 is about 1190.2358991413.

The spelling of 1686161369 in words is "one billion, six hundred eighty-six million, one hundred sixty-one thousand, three hundred sixty-nine".