126274721 has 2 divisors, whose sum is σ = 126274722. Its totient is φ = 126274720.

The previous prime is 126274693. The next prime is 126274723. The reversal of 126274721 is 127472621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70980625 + 55294096 = 8425^2 + 7436^2 .

It is a cyclic number.

It is not a de Polignac number, because 126274721 - 2¹⁸ = 126012577 is a prime.

Together with 126274723, 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 (126274723) 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, 63137360 + 63137361.

It is an arithmetic number, because the mean of its divisors is an integer number (63137361).

Almost surely, 2^126274721 is an apocalyptic number.

It is an amenable number.

126274721 is a deficient number, since it is larger than the sum of its proper divisors (1).

126274721 is an equidigital number, since it uses as much as digits as its factorization.

126274721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 32.

The square root of 126274721 is about 11237.2025433379. The cubic root of 126274721 is about 501.6938830403.

The spelling of 126274721 in words is "one hundred twenty-six million, two hundred seventy-four thousand, seven hundred twenty-one".