109897813 has 2 divisors, whose sum is σ = 109897814. Its totient is φ = 109897812.

The previous prime is 109897789. The next prime is 109897819. The reversal of 109897813 is 318798901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108638929 + 1258884 = 10423^2 + 1122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109897813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109897819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54948906 + 54948907.

It is an arithmetic number, because the mean of its divisors is an integer number (54948907).

Almost surely, 2^109897813 is an apocalyptic number.

It is an amenable number.

109897813 is a deficient number, since it is larger than the sum of its proper divisors (1).

109897813 is an equidigital number, since it uses as much as digits as its factorization.

109897813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 109897813 is about 10483.2157757055. The cubic root of 109897813 is about 478.9935697929.

The spelling of 109897813 in words is "one hundred nine million, eight hundred ninety-seven thousand, eight hundred thirteen".