109638509 has 2 divisors, whose sum is σ = 109638510. Its totient is φ = 109638508.

The previous prime is 109638499. The next prime is 109638553. The reversal of 109638509 is 905836901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108222409 + 1416100 = 10403^2 + 1190^2 .

It is an emirp because it is prime and its reverse (905836901) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109638509 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109638409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54819254 + 54819255.

It is an arithmetic number, because the mean of its divisors is an integer number (54819255).

Almost surely, 2^109638509 is an apocalyptic number.

It is an amenable number.

109638509 is a deficient number, since it is larger than the sum of its proper divisors (1).

109638509 is an equidigital number, since it uses as much as digits as its factorization.

109638509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 109638509 is about 10470.8408926886. The cubic root of 109638509 is about 478.6165445040.

The spelling of 109638509 in words is "one hundred nine million, six hundred thirty-eight thousand, five hundred nine".