126251289 has 12 divisors (see below), whose sum is σ = 187292196. Its totient is φ = 81892512.

The previous prime is 126251287. The next prime is 126251317. The reversal of 126251289 is 982152621.

126251289 is a `hidden beast` number, since 1 + 2 + 62 + 512 + 89 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 117939600 + 8311689 = 10860^2 + 2883^2 .

It is not a de Polignac number, because 126251289 - 2¹ = 126251287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126251287) 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 in 11 ways as a sum of consecutive naturals, for example, 189234 + ... + 189899.

It is an arithmetic number, because the mean of its divisors is an integer number (15607683).

Almost surely, 2^126251289 is an apocalyptic number.

It is an amenable number.

126251289 is a deficient number, since it is larger than the sum of its proper divisors (61040907).

126251289 is a wasteful number, since it uses less digits than its factorization.

126251289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379176 (or 379173 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 126251289 is about 11236.1598867229. The cubic root of 126251289 is about 501.6628490688.

The spelling of 126251289 in words is "one hundred twenty-six million, two hundred fifty-one thousand, two hundred eighty-nine".