685022139 has 12 divisors (see below), whose sum is σ = 990372136. Its totient is φ = 456268032.

The previous prime is 685022113. The next prime is 685022167. The reversal of 685022139 is 931220586.

It is not a de Polignac number, because 685022139 - 2¹³ = 685013947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685022189) 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 in 11 ways as a sum of consecutive naturals, for example, 23782 + ... + 43995.

Almost surely, 2^685022139 is an apocalyptic number.

685022139 is a deficient number, since it is larger than the sum of its proper divisors (305349997).

685022139 is a wasteful number, since it uses less digits than its factorization.

685022139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68906 (or 68903 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 685022139 is about 26172.9275970419. The cubic root of 685022139 is about 881.5254786267.

The spelling of 685022139 in words is "six hundred eighty-five million, twenty-two thousand, one hundred thirty-nine".