688547149 has 2 divisors, whose sum is σ = 688547150. Its totient is φ = 688547148.

The previous prime is 688547131. The next prime is 688547161. The reversal of 688547149 is 941745886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 412821124 + 275726025 = 20318^2 + 16605^2 .

It is a cyclic number.

It is not a de Polignac number, because 688547149 - 2²⁵ = 654992717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 688547096 and 688547105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688547449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344273574 + 344273575.

It is an arithmetic number, because the mean of its divisors is an integer number (344273575).

Almost surely, 2^688547149 is an apocalyptic number.

It is an amenable number.

688547149 is a deficient number, since it is larger than the sum of its proper divisors (1).

688547149 is an equidigital number, since it uses as much as digits as its factorization.

688547149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1935360, while the sum is 52.

The square root of 688547149 is about 26240.1819543996. The cubic root of 688547149 is about 883.0349535792.

The spelling of 688547149 in words is "six hundred eighty-eight million, five hundred forty-seven thousand, one hundred forty-nine".