8109387749 has 2 divisors, whose sum is σ = 8109387750. Its totient is φ = 8109387748.

The previous prime is 8109387733. The next prime is 8109387751. The reversal of 8109387749 is 9477839018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7860063649 + 249324100 = 88657^2 + 15790^2 .

It is a cyclic number.

It is not a de Polignac number, because 8109387749 - 2⁴ = 8109387733 is a prime.

Together with 8109387751, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 8109387694 and 8109387703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8109387779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4054693874 + 4054693875.

It is an arithmetic number, because the mean of its divisors is an integer number (4054693875).

Almost surely, 2^8109387749 is an apocalyptic number.

It is an amenable number.

8109387749 is a deficient number, since it is larger than the sum of its proper divisors (1).

8109387749 is an equidigital number, since it uses as much as digits as its factorization.

8109387749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3048192, while the sum is 56.

The square root of 8109387749 is about 90052.1390584366. The cubic root of 8109387749 is about 2009.0744110131.

The spelling of 8109387749 in words is "eight billion, one hundred nine million, three hundred eighty-seven thousand, seven hundred forty-nine".