685948903 has 4 divisors (see below), whose sum is σ = 686424400. Its totient is φ = 685473408.

The previous prime is 685948891. The next prime is 685948931. The reversal of 685948903 is 309849586.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 309849586 = 2 ⋅154924793.

It is a cyclic number.

It is not a de Polignac number, because 685948903 - 2⁵ = 685948871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685948103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235578 + ... + 238471.

It is an arithmetic number, because the mean of its divisors is an integer number (171606100).

Almost surely, 2^685948903 is an apocalyptic number.

685948903 is a deficient number, since it is larger than the sum of its proper divisors (475497).

685948903 is a wasteful number, since it uses less digits than its factorization.

685948903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475496.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The square root of 685948903 is about 26190.6262429901. The cubic root of 685948903 is about 881.9228370406.

It can be divided in two parts, 68 and 5948903, that multiplied together give a palindrome (404525404).

The spelling of 685948903 in words is "six hundred eighty-five million, nine hundred forty-eight thousand, nine hundred three".