109720813 has 2 divisors, whose sum is σ = 109720814. Its totient is φ = 109720812.

The previous prime is 109720781. The next prime is 109720823. The reversal of 109720813 is 318027901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92968164 + 16752649 = 9642^2 + 4093^2 .

It is an emirp because it is prime and its reverse (318027901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 109720813 - 2⁵ = 109720781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109720823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54860406 + 54860407.

It is an arithmetic number, because the mean of its divisors is an integer number (54860407).

Almost surely, 2^109720813 is an apocalyptic number.

It is an amenable number.

109720813 is a deficient number, since it is larger than the sum of its proper divisors (1).

109720813 is an equidigital number, since it uses as much as digits as its factorization.

109720813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 109720813 is about 10474.7703077442. The cubic root of 109720813 is about 478.7362779916.

The spelling of 109720813 in words is "one hundred nine million, seven hundred twenty thousand, eight hundred thirteen".