126408661 has 2 divisors, whose sum is σ = 126408662. Its totient is φ = 126408660.

The previous prime is 126408649. The next prime is 126408683. The reversal of 126408661 is 166804621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102212100 + 24196561 = 10110^2 + 4919^2 .

It is a cyclic number.

It is not a de Polignac number, because 126408661 - 2⁷ = 126408533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126408641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63204330 + 63204331.

It is an arithmetic number, because the mean of its divisors is an integer number (63204331).

Almost surely, 2^126408661 is an apocalyptic number.

It is an amenable number.

126408661 is a deficient number, since it is larger than the sum of its proper divisors (1).

126408661 is an equidigital number, since it uses as much as digits as its factorization.

126408661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 126408661 is about 11243.1606321354. The cubic root of 126408661 is about 501.8712031286.

The spelling of 126408661 in words is "one hundred twenty-six million, four hundred eight thousand, six hundred sixty-one".