1686937969 has 2 divisors, whose sum is σ = 1686937970. Its totient is φ = 1686937968.

The previous prime is 1686937963. The next prime is 1686937979. The reversal of 1686937969 is 9697396861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1136566369 + 550371600 = 33713^2 + 23460^2 .

It is a cyclic number.

It is not a de Polignac number, because 1686937969 - 2⁷ = 1686937841 is a prime.

It is a super-2 number, since 2×1686937969² = 5691519422507689922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1686937969.

It is not a weakly prime, because it can be changed into another prime (1686937963) 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, 843468984 + 843468985.

It is an arithmetic number, because the mean of its divisors is an integer number (843468985).

Almost surely, 2^1686937969 is an apocalyptic number.

It is an amenable number.

1686937969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1686937969 is an equidigital number, since it uses as much as digits as its factorization.

1686937969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26453952, while the sum is 64.

The square root of 1686937969 is about 41072.3504197167. The cubic root of 1686937969 is about 1190.4186011738.

The spelling of 1686937969 in words is "one billion, six hundred eighty-six million, nine hundred thirty-seven thousand, nine hundred sixty-nine".