126644561 has 8 divisors (see below), whose sum is σ = 128820384. Its totient is φ = 124480800.

The previous prime is 126644513. The next prime is 126644563. The reversal of 126644561 is 165446621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 126644561 - 2¹⁰ = 126643537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126644563) 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 7 ways as a sum of consecutive naturals, for example, 19586 + ... + 25236.

It is an arithmetic number, because the mean of its divisors is an integer number (16102548).

Almost surely, 2^126644561 is an apocalyptic number.

It is an amenable number.

126644561 is a deficient number, since it is larger than the sum of its proper divisors (2175823).

126644561 is an equidigital number, since it uses as much as digits as its factorization.

126644561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6031.

The product of its digits is 34560, while the sum is 35.

The square root of 126644561 is about 11253.6465645585. The cubic root of 126644561 is about 502.1832013888.

The spelling of 126644561 in words is "one hundred twenty-six million, six hundred forty-four thousand, five hundred sixty-one".