685513903 has 2 divisors, whose sum is σ = 685513904. Its totient is φ = 685513902.

The previous prime is 685513859. The next prime is 685513991. The reversal of 685513903 is 309315586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685513903 - 2²⁵ = 651959471 is a prime.

It is a super-2 number, since 2×685513903² = 939858622412586818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685513403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342756951 + 342756952.

It is an arithmetic number, because the mean of its divisors is an integer number (342756952).

Almost surely, 2^685513903 is an apocalyptic number.

685513903 is a deficient number, since it is larger than the sum of its proper divisors (1).

685513903 is an equidigital number, since it uses as much as digits as its factorization.

685513903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 685513903 is about 26182.3204281057. The cubic root of 685513903 is about 881.7363714713.

The spelling of 685513903 in words is "six hundred eighty-five million, five hundred thirteen thousand, nine hundred three".