126899909 has 2 divisors, whose sum is σ = 126899910. Its totient is φ = 126899908.

The previous prime is 126899893. The next prime is 126899987. The reversal of 126899909 is 909998621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114276100 + 12623809 = 10690^2 + 3553^2 .

It is a cyclic number.

It is not a de Polignac number, because 126899909 - 2⁴ = 126899893 is a prime.

It is a super-2 number, since 2×126899909² = 32207173808416562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126899989) 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, 63449954 + 63449955.

It is an arithmetic number, because the mean of its divisors is an integer number (63449955).

Almost surely, 2^126899909 is an apocalyptic number.

It is an amenable number.

126899909 is a deficient number, since it is larger than the sum of its proper divisors (1).

126899909 is an equidigital number, since it uses as much as digits as its factorization.

126899909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 629856, while the sum is 53.

The square root of 126899909 is about 11264.9859742478. The cubic root of 126899909 is about 502.5204849615.

The spelling of 126899909 in words is "one hundred twenty-six million, eight hundred ninety-nine thousand, nine hundred nine".