920697689 has 2 divisors, whose sum is σ = 920697690. Its totient is φ = 920697688.

The previous prime is 920697629. The next prime is 920697697. The reversal of 920697689 is 986796029.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 691690000 + 229007689 = 26300^2 + 15133^2 .

It is a cyclic number.

It is not a de Polignac number, because 920697689 - 2⁸ = 920697433 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (920697629) 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 as a sum of consecutive naturals, namely, 460348844 + 460348845.

It is an arithmetic number, because the mean of its divisors is an integer number (460348845).

Almost surely, 2^920697689 is an apocalyptic number.

It is an amenable number.

920697689 is a deficient number, since it is larger than the sum of its proper divisors (1).

920697689 is an equidigital number, since it uses as much as digits as its factorization.

920697689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 56.

The square root of 920697689 is about 30343.0006591306. Note that the first 3 decimals coincide. The cubic root of 920697689 is about 972.8346208081.

The spelling of 920697689 in words is "nine hundred twenty million, six hundred ninety-seven thousand, six hundred eighty-nine".