126639673 has 2 divisors, whose sum is σ = 126639674. Its totient is φ = 126639672.

The previous prime is 126639671. The next prime is 126639683. The reversal of 126639673 is 376936621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70509609 + 56130064 = 8397^2 + 7492^2 .

It is an emirp because it is prime and its reverse (376936621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126639673 - 2¹ = 126639671 is a prime.

It is a super-3 number, since 3×126639673³ (a number of 25 digits) contains 333 as substring.

Together with 126639671, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (126639671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63319836 + 63319837.

It is an arithmetic number, because the mean of its divisors is an integer number (63319837).

Almost surely, 2^126639673 is an apocalyptic number.

It is an amenable number.

126639673 is a deficient number, since it is larger than the sum of its proper divisors (1).

126639673 is an equidigital number, since it uses as much as digits as its factorization.

126639673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 43.

The square root of 126639673 is about 11253.4293884131. The cubic root of 126639673 is about 502.1767405163.

The spelling of 126639673 in words is "one hundred twenty-six million, six hundred thirty-nine thousand, six hundred seventy-three".