688069231 has 2 divisors, whose sum is σ = 688069232. Its totient is φ = 688069230.

The previous prime is 688069199. The next prime is 688069241. The reversal of 688069231 is 132960886.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 688069231 - 2⁵ = 688069199 is a prime.

It is a super-2 number, since 2×688069231² = 946878533297862722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688069241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344034615 + 344034616.

It is an arithmetic number, because the mean of its divisors is an integer number (344034616).

Almost surely, 2^688069231 is an apocalyptic number.

688069231 is a deficient number, since it is larger than the sum of its proper divisors (1).

688069231 is an equidigital number, since it uses as much as digits as its factorization.

688069231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 688069231 is about 26231.0737675757. The cubic root of 688069231 is about 882.8306025396.

The spelling of 688069231 in words is "six hundred eighty-eight million, sixty-nine thousand, two hundred thirty-one".