126815789 has 2 divisors, whose sum is σ = 126815790. Its totient is φ = 126815788.

The previous prime is 126815737. The next prime is 126815809. The reversal of 126815789 is 987518621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72675625 + 54140164 = 8525^2 + 7358^2 .

It is an emirp because it is prime and its reverse (987518621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126815789 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126815989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63407894 + 63407895.

It is an arithmetic number, because the mean of its divisors is an integer number (63407895).

Almost surely, 2^126815789 is an apocalyptic number.

It is an amenable number.

126815789 is a deficient number, since it is larger than the sum of its proper divisors (1).

126815789 is an equidigital number, since it uses as much as digits as its factorization.

126815789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 47.

The square root of 126815789 is about 11261.2516622265. The cubic root of 126815789 is about 502.4094227144.

The spelling of 126815789 in words is "one hundred twenty-six million, eight hundred fifteen thousand, seven hundred eighty-nine".