688139103 has 4 divisors (see below), whose sum is σ = 917518808. Its totient is φ = 458759400.

The previous prime is 688139083. The next prime is 688139113. The reversal of 688139103 is 301931886.

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

It is not a de Polignac number, because 688139103 - 2⁵ = 688139071 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 (688139113) 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, 114689848 + ... + 114689853.

It is an arithmetic number, because the mean of its divisors is an integer number (229379702).

Almost surely, 2^688139103 is an apocalyptic number.

688139103 is a deficient number, since it is larger than the sum of its proper divisors (229379705).

688139103 is a wasteful number, since it uses less digits than its factorization.

688139103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229379704.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 688139103 is about 26232.4055892707. The cubic root of 688139103 is about 882.8604847323.

The spelling of 688139103 in words is "six hundred eighty-eight million, one hundred thirty-nine thousand, one hundred three".