1685138167 has 2 divisors, whose sum is σ = 1685138168. Its totient is φ = 1685138166.

The previous prime is 1685138131. The next prime is 1685138219. The reversal of 1685138167 is 7618315861.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1685138167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1685138267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842569083 + 842569084.

It is an arithmetic number, because the mean of its divisors is an integer number (842569084).

Almost surely, 2^1685138167 is an apocalyptic number.

1685138167 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685138167 is an equidigital number, since it uses as much as digits as its factorization.

1685138167 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 46.

The square root of 1685138167 is about 41050.4344313188. The cubic root of 1685138167 is about 1189.9950961359.

The spelling of 1685138167 in words is "one billion, six hundred eighty-five million, one hundred thirty-eight thousand, one hundred sixty-seven".