126637549 has 2 divisors, whose sum is σ = 126637550. Its totient is φ = 126637548.

The previous prime is 126637543. The next prime is 126637559. The reversal of 126637549 is 945736621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65124900 + 61512649 = 8070^2 + 7843^2 .

It is an emirp because it is prime and its reverse (945736621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126637549 - 2¹⁷ = 126506477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126637543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63318774 + 63318775.

It is an arithmetic number, because the mean of its divisors is an integer number (63318775).

Almost surely, 2^126637549 is an apocalyptic number.

It is an amenable number.

126637549 is a deficient number, since it is larger than the sum of its proper divisors (1).

126637549 is an equidigital number, since it uses as much as digits as its factorization.

126637549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 43.

The square root of 126637549 is about 11253.3350167850. The cubic root of 126637549 is about 502.1739329987.

The spelling of 126637549 in words is "one hundred twenty-six million, six hundred thirty-seven thousand, five hundred forty-nine".