126972289 has 2 divisors, whose sum is σ = 126972290. Its totient is φ = 126972288.

The previous prime is 126972253. The next prime is 126972317. The reversal of 126972289 is 982279621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84787264 + 42185025 = 9208^2 + 6495^2 .

It is a cyclic number.

It is not a de Polignac number, because 126972289 - 2¹¹ = 126970241 is a prime.

It is a super-2 number, since 2×126972289² = 32243924347799042, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (126972229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63486144 + 63486145.

It is an arithmetic number, because the mean of its divisors is an integer number (63486145).

Almost surely, 2^126972289 is an apocalyptic number.

It is an amenable number.

126972289 is a deficient number, since it is larger than the sum of its proper divisors (1).

126972289 is an equidigital number, since it uses as much as digits as its factorization.

126972289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 126972289 is about 11268.1981256987. The cubic root of 126972289 is about 502.6160078028.

The spelling of 126972289 in words is "one hundred twenty-six million, nine hundred seventy-two thousand, two hundred eighty-nine".