1685376449 has 2 divisors, whose sum is σ = 1685376450. Its totient is φ = 1685376448.

The previous prime is 1685376403. The next prime is 1685376467. The reversal of 1685376449 is 9446735861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1541975824 + 143400625 = 39268^2 + 11975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1685376449 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 1685376449.

It is not a weakly prime, because it can be changed into another prime (1685378449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842688224 + 842688225.

It is an arithmetic number, because the mean of its divisors is an integer number (842688225).

Almost surely, 2^1685376449 is an apocalyptic number.

It is an amenable number.

1685376449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685376449 is an equidigital number, since it uses as much as digits as its factorization.

1685376449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4354560, while the sum is 53.

The square root of 1685376449 is about 41053.3366366243. The cubic root of 1685376449 is about 1190.0511827431.

The spelling of 1685376449 in words is "one billion, six hundred eighty-five million, three hundred seventy-six thousand, four hundred forty-nine".