688610851 has 2 divisors, whose sum is σ = 688610852. Its totient is φ = 688610850.

The previous prime is 688610837. The next prime is 688610873. The reversal of 688610851 is 158016886.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 688610851 - 2⁹ = 688610339 is a prime.

It is a super-2 number, since 2×688610851² = 948369808229888402, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 688610798 and 688610807.

It is not a weakly prime, because it can be changed into another prime (688680851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344305425 + 344305426.

It is an arithmetic number, because the mean of its divisors is an integer number (344305426).

Almost surely, 2^688610851 is an apocalyptic number.

688610851 is a deficient number, since it is larger than the sum of its proper divisors (1).

688610851 is an equidigital number, since it uses as much as digits as its factorization.

688610851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92160, while the sum is 43.

The square root of 688610851 is about 26241.3957517507. The cubic root of 688610851 is about 883.0621845190.

The spelling of 688610851 in words is "six hundred eighty-eight million, six hundred ten thousand, eight hundred fifty-one".