685915030391 has 2 divisors, whose sum is σ = 685915030392. Its totient is φ = 685915030390.

The previous prime is 685915030369. The next prime is 685915030417. The reversal of 685915030391 is 193030519586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685915030391 - 2¹⁰ = 685915029367 is a prime.

It is a super-2 number, since 2×685915030391² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685915032391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342957515195 + 342957515196.

It is an arithmetic number, because the mean of its divisors is an integer number (342957515196).

Almost surely, 2^685915030391 is an apocalyptic number.

685915030391 is a deficient number, since it is larger than the sum of its proper divisors (1).

685915030391 is an equidigital number, since it uses as much as digits as its factorization.

685915030391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 874800, while the sum is 50.

The spelling of 685915030391 in words is "six hundred eighty-five billion, nine hundred fifteen million, thirty thousand, three hundred ninety-one".