109787813 has 2 divisors, whose sum is σ = 109787814. Its totient is φ = 109787812.

The previous prime is 109787807. The next prime is 109787851. The reversal of 109787813 is 318787901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105719524 + 4068289 = 10282^2 + 2017^2 .

It is an emirp because it is prime and its reverse (318787901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 109787813 - 2²⁰ = 108739237 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109787863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54893906 + 54893907.

It is an arithmetic number, because the mean of its divisors is an integer number (54893907).

Almost surely, 2^109787813 is an apocalyptic number.

It is an amenable number.

109787813 is a deficient number, since it is larger than the sum of its proper divisors (1).

109787813 is an equidigital number, since it uses as much as digits as its factorization.

109787813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 44.

The square root of 109787813 is about 10477.9679804817. The cubic root of 109787813 is about 478.8337034576.

The spelling of 109787813 in words is "one hundred nine million, seven hundred eighty-seven thousand, eight hundred thirteen".