109920689 has 2 divisors, whose sum is σ = 109920690. Its totient is φ = 109920688.

The previous prime is 109920677. The next prime is 109920697. The reversal of 109920689 is 986029901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99840064 + 10080625 = 9992^2 + 3175^2 .

It is a cyclic number.

It is not a de Polignac number, because 109920689 - 2²⁴ = 93143473 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 (109920089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54960344 + 54960345.

It is an arithmetic number, because the mean of its divisors is an integer number (54960345).

Almost surely, 2^109920689 is an apocalyptic number.

It is an amenable number.

109920689 is a deficient number, since it is larger than the sum of its proper divisors (1).

109920689 is an equidigital number, since it uses as much as digits as its factorization.

109920689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 109920689 is about 10484.3067963504. The cubic root of 109920689 is about 479.0268027767.

The spelling of 109920689 in words is "one hundred nine million, nine hundred twenty thousand, six hundred eighty-nine".