688541629 has 2 divisors, whose sum is σ = 688541630. Its totient is φ = 688541628.

The previous prime is 688541591. The next prime is 688541641. The reversal of 688541629 is 926145886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 669619129 + 18922500 = 25877^2 + 4350^2 .

It is a cyclic number.

It is not a de Polignac number, because 688541629 - 2¹⁷ = 688410557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688541669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344270814 + 344270815.

It is an arithmetic number, because the mean of its divisors is an integer number (344270815).

Almost surely, 2^688541629 is an apocalyptic number.

It is an amenable number.

688541629 is a deficient number, since it is larger than the sum of its proper divisors (1).

688541629 is an equidigital number, since it uses as much as digits as its factorization.

688541629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 49.

The square root of 688541629 is about 26240.0767719914. The cubic root of 688541629 is about 883.0325938444.

The spelling of 688541629 in words is "six hundred eighty-eight million, five hundred forty-one thousand, six hundred twenty-nine".