688605131 has 16 divisors (see below), whose sum is σ = 716083200. Its totient is φ = 661750848.

The previous prime is 688605121. The next prime is 688605143. The reversal of 688605131 is 131506886.

It is a happy number.

688605131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 688605131 - 2⁶ = 688605067 is a prime.

It is a super-2 number, since 2×688605131² = 948354052879054322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688605121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1437350 + ... + 1437828.

It is an arithmetic number, because the mean of its divisors is an integer number (44755200).

Almost surely, 2^688605131 is an apocalyptic number.

688605131 is a deficient number, since it is larger than the sum of its proper divisors (27478069).

688605131 is a wasteful number, since it uses less digits than its factorization.

688605131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 688605131 is about 26241.2867634192. The cubic root of 688605131 is about 883.0597394371.

The spelling of 688605131 in words is "six hundred eighty-eight million, six hundred five thousand, one hundred thirty-one".