126317309 has 2 divisors, whose sum is σ = 126317310. Its totient is φ = 126317308.

The previous prime is 126317267. The next prime is 126317329. The reversal of 126317309 is 903713621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122102500 + 4214809 = 11050^2 + 2053^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126317309 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_7180862 and since 126317309 and 7180862 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126317329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63158654 + 63158655.

It is an arithmetic number, because the mean of its divisors is an integer number (63158655).

Almost surely, 2^126317309 is an apocalyptic number.

It is an amenable number.

126317309 is a deficient number, since it is larger than the sum of its proper divisors (1).

126317309 is an equidigital number, since it uses as much as digits as its factorization.

126317309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 126317309 is about 11239.0973391994. The cubic root of 126317309 is about 501.7502779053.

The spelling of 126317309 in words is "one hundred twenty-six million, three hundred seventeen thousand, three hundred nine".