689500949 has 2 divisors, whose sum is σ = 689500950. Its totient is φ = 689500948.

The previous prime is 689500901. The next prime is 689500967. The reversal of 689500949 is 949005986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 625900324 + 63600625 = 25018^2 + 7975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689500949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 689500897 and 689500906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689500979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344750474 + 344750475.

It is an arithmetic number, because the mean of its divisors is an integer number (344750475).

Almost surely, 2^689500949 is an apocalyptic number.

It is an amenable number.

689500949 is a deficient number, since it is larger than the sum of its proper divisors (1).

689500949 is an equidigital number, since it uses as much as digits as its factorization.

689500949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 689500949 is about 26258.3500814503. The cubic root of 689500949 is about 883.4425025946.

The spelling of 689500949 in words is "six hundred eighty-nine million, five hundred thousand, nine hundred forty-nine".