126203669 has 2 divisors, whose sum is σ = 126203670. Its totient is φ = 126203668.

The previous prime is 126203647. The next prime is 126203677. The reversal of 126203669 is 966302621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123099025 + 3104644 = 11095^2 + 1762^2 .

It is an emirp because it is prime and its reverse (966302621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126203669 is a prime.

It is a super-2 number, since 2×126203669² = 31854732138123122, which contains 22 as substring.

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 (126203629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63101834 + 63101835.

It is an arithmetic number, because the mean of its divisors is an integer number (63101835).

Almost surely, 2^126203669 is an apocalyptic number.

It is an amenable number.

126203669 is a deficient number, since it is larger than the sum of its proper divisors (1).

126203669 is an equidigital number, since it uses as much as digits as its factorization.

126203669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 126203669 is about 11234.0406354971. The cubic root of 126203669 is about 501.5997680256.

The spelling of 126203669 in words is "one hundred twenty-six million, two hundred three thousand, six hundred sixty-nine".