685965081 has 4 divisors (see below), whose sum is σ = 914620112. Its totient is φ = 457310052.

The previous prime is 685965073. The next prime is 685965083. The reversal of 685965081 is 180569586.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 685965081 - 2³ = 685965073 is a prime.

It is a super-2 number, since 2×685965081² = 941096184702673122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 685965081.

It is not an unprimeable number, because it can be changed into a prime (685965083) 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 3 ways as a sum of consecutive naturals, for example, 114327511 + ... + 114327516.

It is an arithmetic number, because the mean of its divisors is an integer number (228655028).

Almost surely, 2^685965081 is an apocalyptic number.

It is an amenable number.

685965081 is a deficient number, since it is larger than the sum of its proper divisors (228655031).

685965081 is a wasteful number, since it uses less digits than its factorization.

685965081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228655030.

The product of its (nonzero) digits is 518400, while the sum is 48.

The square root of 685965081 is about 26190.9350921268. The cubic root of 685965081 is about 881.9297703245.

The spelling of 685965081 in words is "six hundred eighty-five million, nine hundred sixty-five thousand, eighty-one".