126278213 has 2 divisors, whose sum is σ = 126278214. Its totient is φ = 126278212.

The previous prime is 126278203. The next prime is 126278233. The reversal of 126278213 is 312872621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85803169 + 40475044 = 9263^2 + 6362^2 .

It is a cyclic number.

It is not a de Polignac number, because 126278213 - 2⁴ = 126278197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 126278213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126278203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63139106 + 63139107.

It is an arithmetic number, because the mean of its divisors is an integer number (63139107).

Almost surely, 2^126278213 is an apocalyptic number.

It is an amenable number.

126278213 is a deficient number, since it is larger than the sum of its proper divisors (1).

126278213 is an equidigital number, since it uses as much as digits as its factorization.

126278213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 32.

The square root of 126278213 is about 11237.3579190128. The cubic root of 126278213 is about 501.6985076104.

The spelling of 126278213 in words is "one hundred twenty-six million, two hundred seventy-eight thousand, two hundred thirteen".