1685131138 has 16 divisors (see below), whose sum is σ = 2583780480. Its totient is φ = 823903056.

The previous prime is 1685131121. The next prime is 1685131163. The reversal of 1685131138 is 8311315861.

It is a junction number, because it is equal to n+sod(n) for n = 1685131097 and 1685131106.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 106633 + ... + 121411.

It is an arithmetic number, because the mean of its divisors is an integer number (161486280).

Almost surely, 2^1685131138 is an apocalyptic number.

1685131138 is a deficient number, since it is larger than the sum of its proper divisors (898649342).

1685131138 is a wasteful number, since it uses less digits than its factorization.

1685131138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16041.

The product of its digits is 17280, while the sum is 37.

The square root of 1685131138 is about 41050.3488170320. The cubic root of 1685131138 is about 1189.9934415758.

Adding to 1685131138 its reverse (8311315861), we get a palindrome (9996446999).

The spelling of 1685131138 in words is "one billion, six hundred eighty-five million, one hundred thirty-one thousand, one hundred thirty-eight".