689388149 has 2 divisors, whose sum is σ = 689388150. Its totient is φ = 689388148.

The previous prime is 689388113. The next prime is 689388179. The reversal of 689388149 is 941883986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 625500100 + 63888049 = 25010^2 + 7993^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689388149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 689388094 and 689388103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689388179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344694074 + 344694075.

It is an arithmetic number, because the mean of its divisors is an integer number (344694075).

Almost surely, 2^689388149 is an apocalyptic number.

It is an amenable number.

689388149 is a deficient number, since it is larger than the sum of its proper divisors (1).

689388149 is an equidigital number, since it uses as much as digits as its factorization.

689388149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2985984, while the sum is 56.

The square root of 689388149 is about 26256.2021054074. The cubic root of 689388149 is about 883.3943239087.

The spelling of 689388149 in words is "six hundred eighty-nine million, three hundred eighty-eight thousand, one hundred forty-nine".