689277121 has 8 divisors (see below), whose sum is σ = 785963304. Its totient is φ = 598828800.

The previous prime is 689277109. The next prime is 689277131. The reversal of 689277121 is 121772986.

It can be written as a sum of positive squares in 4 ways, for example, as 224400400 + 464876721 = 14980^2 + 21561^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 689277121 - 2⁷ = 689276993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689277131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1559230 + ... + 1559671.

It is an arithmetic number, because the mean of its divisors is an integer number (98245413).

Almost surely, 2^689277121 is an apocalyptic number.

It is an amenable number.

689277121 is a deficient number, since it is larger than the sum of its proper divisors (96686183).

689277121 is a wasteful number, since it uses less digits than its factorization.

689277121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3118931.

The product of its digits is 84672, while the sum is 43.

The square root of 689277121 is about 26254.0877007753. The cubic root of 689277121 is about 883.3468969398.

The spelling of 689277121 in words is "six hundred eighty-nine million, two hundred seventy-seven thousand, one hundred twenty-one".