109800661 has 2 divisors, whose sum is σ = 109800662. Its totient is φ = 109800660.

The previous prime is 109800611. The next prime is 109800673. The reversal of 109800661 is 166008901.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88924900 + 20875761 = 9430^2 + 4569^2 .

It is a cyclic number.

It is not a de Polignac number, because 109800661 - 2⁷ = 109800533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109800611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54900330 + 54900331.

It is an arithmetic number, because the mean of its divisors is an integer number (54900331).

Almost surely, 2^109800661 is an apocalyptic number.

It is an amenable number.

109800661 is a deficient number, since it is larger than the sum of its proper divisors (1).

109800661 is an equidigital number, since it uses as much as digits as its factorization.

109800661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 109800661 is about 10478.5810585212. The cubic root of 109800661 is about 478.8523813517.

The spelling of 109800661 in words is "one hundred nine million, eight hundred thousand, six hundred sixty-one".