1685716493 has 2 divisors, whose sum is σ = 1685716494. Its totient is φ = 1685716492.

The previous prime is 1685716477. The next prime is 1685716519. The reversal of 1685716493 is 3946175861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1386668644 + 299047849 = 37238^2 + 17293^2 .

It is a cyclic number.

It is not a de Polignac number, because 1685716493 - 2⁴ = 1685716477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1685716453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842858246 + 842858247.

It is an arithmetic number, because the mean of its divisors is an integer number (842858247).

Almost surely, 2^1685716493 is an apocalyptic number.

It is an amenable number.

1685716493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685716493 is an equidigital number, since it uses as much as digits as its factorization.

1685716493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 50.

The square root of 1685716493 is about 41057.4779181576. The cubic root of 1685716493 is about 1190.1312128460.

The spelling of 1685716493 in words is "one billion, six hundred eighty-five million, seven hundred sixteen thousand, four hundred ninety-three".