1226126561 has 8 divisors (see below), whose sum is σ = 1340644800. Its totient is φ = 1112117040.

The previous prime is 1226126543. The next prime is 1226126569. The reversal of 1226126561 is 1656216221.

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 1226126561 - 2³⁰ = 152384737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1226126569) 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, 122126 + ... + 131783.

It is an arithmetic number, because the mean of its divisors is an integer number (167580600).

Almost surely, 2^1226126561 is an apocalyptic number.

1226126561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1226126561 is a deficient number, since it is larger than the sum of its proper divisors (114518239).

1226126561 is a wasteful number, since it uses less digits than its factorization.

1226126561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254359.

The product of its digits is 8640, while the sum is 32.

The square root of 1226126561 is about 35016.0900301561. The cubic root of 1226126561 is about 1070.3153817463.

The spelling of 1226126561 in words is "one billion, two hundred twenty-six million, one hundred twenty-six thousand, five hundred sixty-one".