126930257 has 2 divisors, whose sum is σ = 126930258. Its totient is φ = 126930256.

The previous prime is 126930247. The next prime is 126930259. The reversal of 126930257 is 752039621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63504961 + 63425296 = 7969^2 + 7964^2 .

It is a cyclic number.

It is not a de Polignac number, because 126930257 - 2¹⁰ = 126929233 is a prime.

It is a super-2 number, since 2×126930257² = 32222580284172098, which contains 22 as substring.

Together with 126930259, 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 (126930259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63465128 + 63465129.

It is an arithmetic number, because the mean of its divisors is an integer number (63465129).

Almost surely, 2^126930257 is an apocalyptic number.

It is an amenable number.

126930257 is a deficient number, since it is larger than the sum of its proper divisors (1).

126930257 is an equidigital number, since it uses as much as digits as its factorization.

126930257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 126930257 is about 11266.3328993954. The cubic root of 126930257 is about 502.5605408770.

Adding to 126930257 its reverse (752039621), we get a palindrome (878969878).

The spelling of 126930257 in words is "one hundred twenty-six million, nine hundred thirty thousand, two hundred fifty-seven".