1685149693 has 4 divisors (see below), whose sum is σ = 1691414460. Its totient is φ = 1678884928.

The previous prime is 1685149657. The next prime is 1685149699. The reversal of 1685149693 is 3969415861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 210743289 + 1474406404 = 14517^2 + 38398^2 .

It is a cyclic number.

It is not a de Polignac number, because 1685149693 - 2¹³ = 1685141501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1685149693.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685149699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3131980 + ... + 3132517.

It is an arithmetic number, because the mean of its divisors is an integer number (422853615).

Almost surely, 2^1685149693 is an apocalyptic number.

It is an amenable number.

1685149693 is a deficient number, since it is larger than the sum of its proper divisors (6264767).

1685149693 is an equidigital number, since it uses as much as digits as its factorization.

1685149693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6264766.

The product of its digits is 1399680, while the sum is 52.

The square root of 1685149693 is about 41050.5748193615. The cubic root of 1685149693 is about 1189.9978092373.

The spelling of 1685149693 in words is "one billion, six hundred eighty-five million, one hundred forty-nine thousand, six hundred ninety-three".