685187107 has 4 divisors (see below), whose sum is σ = 747476856. Its totient is φ = 622897360.

The previous prime is 685187081. The next prime is 685187123. The reversal of 685187107 is 701781586.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685187107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685187507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31144858 + ... + 31144879.

It is an arithmetic number, because the mean of its divisors is an integer number (186869214).

Almost surely, 2^685187107 is an apocalyptic number.

685187107 is a deficient number, since it is larger than the sum of its proper divisors (62289749).

685187107 is a wasteful number, since it uses less digits than its factorization.

685187107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62289748.

The product of its (nonzero) digits is 94080, while the sum is 43.

The square root of 685187107 is about 26176.0789080412. The cubic root of 685187107 is about 881.5962363510.

It can be divided in two parts, 68518 and 7107, that added together give a square (75625 = 275²).

The spelling of 685187107 in words is "six hundred eighty-five million, one hundred eighty-seven thousand, one hundred seven".