126808109 has 6 divisors (see below), whose sum is σ = 133833870. Its totient is φ = 120133656.

The previous prime is 126808091. The next prime is 126808127. The reversal of 126808109 is 901808621.

It is an interprime number because it is at equal distance from previous prime (126808091) and next prime (126808127).

It can be written as a sum of positive squares in only one way, i.e., 77387209 + 49420900 = 8797^2 + 7030^2 .

It is not a de Polignac number, because 126808109 - 2¹⁶ = 126742573 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126808189) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 175274 + ... + 175995.

It is an arithmetic number, because the mean of its divisors is an integer number (22305645).

Almost surely, 2^126808109 is an apocalyptic number.

126808109 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

126808109 is a deficient number, since it is larger than the sum of its proper divisors (7025761).

126808109 is an equidigital number, since it uses as much as digits as its factorization.

126808109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351307 (or 351288 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 126808109 is about 11260.9106647731. The cubic root of 126808109 is about 502.3992804908.

The spelling of 126808109 in words is "one hundred twenty-six million, eight hundred eight thousand, one hundred nine".