126194681 has 2 divisors, whose sum is σ = 126194682. Its totient is φ = 126194680.

The previous prime is 126194659. The next prime is 126194683. The reversal of 126194681 is 186491621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81090025 + 45104656 = 9005^2 + 6716^2 .

It is a cyclic number.

It is not a de Polignac number, because 126194681 - 2¹⁸ = 125932537 is a prime.

It is a super-2 number, since 2×126194681² = 31850195025383522, which contains 22 as substring.

Together with 126194683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (126194683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63097340 + 63097341.

It is an arithmetic number, because the mean of its divisors is an integer number (63097341).

Almost surely, 2^126194681 is an apocalyptic number.

It is an amenable number.

126194681 is a deficient number, since it is larger than the sum of its proper divisors (1).

126194681 is an equidigital number, since it uses as much as digits as its factorization.

126194681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 126194681 is about 11233.6405942152. The cubic root of 126194681 is about 501.5878600629.

The spelling of 126194681 in words is "one hundred twenty-six million, one hundred ninety-four thousand, six hundred eighty-one".