126645289 has 4 divisors (see below), whose sum is σ = 127642624. Its totient is φ = 125647956.

The previous prime is 126645251. The next prime is 126645293. The reversal of 126645289 is 982546621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 126645289 - 2²⁵ = 93090857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126645229) 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 3 ways as a sum of consecutive naturals, for example, 498477 + ... + 498730.

It is an arithmetic number, because the mean of its divisors is an integer number (31910656).

Almost surely, 2^126645289 is an apocalyptic number.

It is an amenable number.

126645289 is a deficient number, since it is larger than the sum of its proper divisors (997335).

126645289 is an equidigital number, since it uses as much as digits as its factorization.

126645289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997334.

The product of its digits is 207360, while the sum is 43.

The square root of 126645289 is about 11253.6789095833. The cubic root of 126645289 is about 502.1841636322.

The spelling of 126645289 in words is "one hundred twenty-six million, six hundred forty-five thousand, two hundred eighty-nine".