126390137 has 2 divisors, whose sum is σ = 126390138. Its totient is φ = 126390136.

The previous prime is 126390133. The next prime is 126390139. The reversal of 126390137 is 731093621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125865961 + 524176 = 11219^2 + 724^2 .

It is an emirp because it is prime and its reverse (731093621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126390137 - 2² = 126390133 is a prime.

Together with 126390139, 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 (126390133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63195068 + 63195069.

It is an arithmetic number, because the mean of its divisors is an integer number (63195069).

Almost surely, 2^126390137 is an apocalyptic number.

It is an amenable number.

126390137 is a deficient number, since it is larger than the sum of its proper divisors (1).

126390137 is an equidigital number, since it uses as much as digits as its factorization.

126390137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 126390137 is about 11242.3368122468. The cubic root of 126390137 is about 501.8466870966.

The spelling of 126390137 in words is "one hundred twenty-six million, three hundred ninety thousand, one hundred thirty-seven".