126445661 has 2 divisors, whose sum is σ = 126445662. Its totient is φ = 126445660.

The previous prime is 126445639. The next prime is 126445663. The reversal of 126445661 is 166544621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101505625 + 24940036 = 10075^2 + 4994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126445661 is a prime.

Together with 126445663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126445663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63222830 + 63222831.

It is an arithmetic number, because the mean of its divisors is an integer number (63222831).

Almost surely, 2^126445661 is an apocalyptic number.

It is an amenable number.

126445661 is a deficient number, since it is larger than the sum of its proper divisors (1).

126445661 is an equidigital number, since it uses as much as digits as its factorization.

126445661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The square root of 126445661 is about 11244.8059565294. The cubic root of 126445661 is about 501.9201644970.

The spelling of 126445661 in words is "one hundred twenty-six million, four hundred forty-five thousand, six hundred sixty-one".