689634149 has 8 divisors (see below), whose sum is σ = 714822528. Its totient is φ = 664884000.

The previous prime is 689634137. The next prime is 689634151. The reversal of 689634149 is 941436986.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689634149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 689634097 and 689634106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689634119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106352 + ... + 112649.

It is an arithmetic number, because the mean of its divisors is an integer number (89352816).

Almost surely, 2^689634149 is an apocalyptic number.

It is an amenable number.

689634149 is a deficient number, since it is larger than the sum of its proper divisors (25188379).

689634149 is a wasteful number, since it uses less digits than its factorization.

689634149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219115.

The product of its digits is 1119744, while the sum is 50.

The square root of 689634149 is about 26260.8862950206. The cubic root of 689634149 is about 883.4993876817.

The spelling of 689634149 in words is "six hundred eighty-nine million, six hundred thirty-four thousand, one hundred forty-nine".