688867161 has 4 divisors (see below), whose sum is σ = 918489552. Its totient is φ = 459244772.

The previous prime is 688867159. The next prime is 688867163. The reversal of 688867161 is 161768886.

688867161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (688867159) and next prime (688867163).

It is a cyclic number.

It is not a de Polignac number, because 688867161 - 2¹ = 688867159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (688867163) 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, 114811191 + ... + 114811196.

It is an arithmetic number, because the mean of its divisors is an integer number (229622388).

Almost surely, 2^688867161 is an apocalyptic number.

It is an amenable number.

688867161 is a deficient number, since it is larger than the sum of its proper divisors (229622391).

688867161 is a wasteful number, since it uses less digits than its factorization.

688867161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229622390.

The product of its digits is 774144, while the sum is 51.

The square root of 688867161 is about 26246.2789934116. The cubic root of 688867161 is about 883.1717333748.

The spelling of 688867161 in words is "six hundred eighty-eight million, eight hundred sixty-seven thousand, one hundred sixty-one".