126199861 has 2 divisors, whose sum is σ = 126199862. Its totient is φ = 126199860.

The previous prime is 126199847. The next prime is 126199889. The reversal of 126199861 is 168991621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82719025 + 43480836 = 9095^2 + 6594^2 .

It is a cyclic number.

It is not a de Polignac number, because 126199861 - 2²⁵ = 92645429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126199811) 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, 63099930 + 63099931.

It is an arithmetic number, because the mean of its divisors is an integer number (63099931).

Almost surely, 2^126199861 is an apocalyptic number.

It is an amenable number.

126199861 is a deficient number, since it is larger than the sum of its proper divisors (1).

126199861 is an equidigital number, since it uses as much as digits as its factorization.

126199861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 43.

The square root of 126199861 is about 11233.8711493412. The cubic root of 126199861 is about 501.5947229764.

The spelling of 126199861 in words is "one hundred twenty-six million, one hundred ninety-nine thousand, eight hundred sixty-one".