688357451 has 2 divisors, whose sum is σ = 688357452. Its totient is φ = 688357450.

The previous prime is 688357391. The next prime is 688357463. The reversal of 688357451 is 154753886.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688357451 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 688357396 and 688357405.

It is not a weakly prime, because it can be changed into another prime (688357151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344178725 + 344178726.

It is an arithmetic number, because the mean of its divisors is an integer number (344178726).

Almost surely, 2^688357451 is an apocalyptic number.

688357451 is a deficient number, since it is larger than the sum of its proper divisors (1).

688357451 is an equidigital number, since it uses as much as digits as its factorization.

688357451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 806400, while the sum is 47.

The square root of 688357451 is about 26236.5670582110. The cubic root of 688357451 is about 882.9538526938.

The spelling of 688357451 in words is "six hundred eighty-eight million, three hundred fifty-seven thousand, four hundred fifty-one".