688122231 has 4 divisors (see below), whose sum is σ = 917496312. Its totient is φ = 458748152.

The previous prime is 688122217. The next prime is 688122233. The reversal of 688122231 is 132221886.

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

It is a cyclic number.

It is not a de Polignac number, because 688122231 - 2⁵ = 688122199 is a prime.

It is a super-2 number, since 2×688122231² = 947024409592834722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 688122192 and 688122201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688122233) 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, 114687036 + ... + 114687041.

It is an arithmetic number, because the mean of its divisors is an integer number (229374078).

Almost surely, 2^688122231 is an apocalyptic number.

688122231 is a deficient number, since it is larger than the sum of its proper divisors (229374081).

688122231 is a wasteful number, since it uses less digits than its factorization.

688122231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229374080.

The product of its digits is 9216, while the sum is 33.

The square root of 688122231 is about 26232.0840003230. The cubic root of 688122231 is about 882.8532692610.

The spelling of 688122231 in words is "six hundred eighty-eight million, one hundred twenty-two thousand, two hundred thirty-one".