814725689 has 2 divisors, whose sum is σ = 814725690. Its totient is φ = 814725688.

The previous prime is 814725661. The next prime is 814725721. The reversal of 814725689 is 986527418.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 746382400 + 68343289 = 27320^2 + 8267^2 .

It is a cyclic number.

It is not a de Polignac number, because 814725689 - 2¹⁶ = 814660153 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (814725889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407362844 + 407362845.

It is an arithmetic number, because the mean of its divisors is an integer number (407362845).

Almost surely, 2^814725689 is an apocalyptic number.

It is an amenable number.

814725689 is a deficient number, since it is larger than the sum of its proper divisors (1).

814725689 is an equidigital number, since it uses as much as digits as its factorization.

814725689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 50.

The square root of 814725689 is about 28543.4000952935. The cubic root of 814725689 is about 933.9790543351.

The spelling of 814725689 in words is "eight hundred fourteen million, seven hundred twenty-five thousand, six hundred eighty-nine".