126944561 has 4 divisors (see below), whose sum is σ = 128109300. Its totient is φ = 125779824.

The previous prime is 126944537. The next prime is 126944621. The reversal of 126944561 is 165449621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68574961 + 58369600 = 8281^2 + 7640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126944561 is a prime.

It is a super-2 number, since 2×126944561² = 32229843134965442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126944161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 582206 + ... + 582423.

It is an arithmetic number, because the mean of its divisors is an integer number (32027325).

Almost surely, 2^126944561 is an apocalyptic number.

It is an amenable number.

126944561 is a deficient number, since it is larger than the sum of its proper divisors (1164739).

126944561 is a wasteful number, since it uses less digits than its factorization.

126944561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164738.

The product of its digits is 51840, while the sum is 38.

The square root of 126944561 is about 11266.9676932172. The cubic root of 126944561 is about 502.5794183197.

The spelling of 126944561 in words is "one hundred twenty-six million, nine hundred forty-four thousand, five hundred sixty-one".