126991297 has 2 divisors, whose sum is σ = 126991298. Its totient is φ = 126991296.

The previous prime is 126991223. The next prime is 126991301. The reversal of 126991297 is 792199621.

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., 125529616 + 1461681 = 11204^2 + 1209^2 .

It is a cyclic number.

It is not a de Polignac number, because 126991297 - 2¹⁵ = 126958529 is a prime.

It is a super-3 number, since 3×126991297³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (126991897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63495648 + 63495649.

It is an arithmetic number, because the mean of its divisors is an integer number (63495649).

Almost surely, 2^126991297 is an apocalyptic number.

It is an amenable number.

126991297 is a deficient number, since it is larger than the sum of its proper divisors (1).

126991297 is an equidigital number, since it uses as much as digits as its factorization.

126991297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 46.

The square root of 126991297 is about 11269.0415297842. The cubic root of 126991297 is about 502.6410874178.

The spelling of 126991297 in words is "one hundred twenty-six million, nine hundred ninety-one thousand, two hundred ninety-seven".