685031369 has 4 divisors (see below), whose sum is σ = 747306960. Its totient is φ = 622755780.

The previous prime is 685031353. The next prime is 685031381. The reversal of 685031369 is 963130586.

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 a cyclic number.

It is not a de Polignac number, because 685031369 - 2⁴ = 685031353 is a prime.

It is a super-2 number, since 2×685031369² = 938535953028028322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (685031329) 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, 31137779 + ... + 31137800.

It is an arithmetic number, because the mean of its divisors is an integer number (186826740).

Almost surely, 2^685031369 is an apocalyptic number.

It is an amenable number.

685031369 is a deficient number, since it is larger than the sum of its proper divisors (62275591).

685031369 is a wasteful number, since it uses less digits than its factorization.

685031369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62275590.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 685031369 is about 26173.1039236847. The cubic root of 685031369 is about 881.5294378387.

The spelling of 685031369 in words is "six hundred eighty-five million, thirty-one thousand, three hundred sixty-nine".