1281103500561 has 8 divisors (see below), whose sum is σ = 1710513717120. Its totient is φ = 852881142192.

The previous prime is 1281103500557. The next prime is 1281103500571. The reversal of 1281103500561 is 1650053011821.

It is a happy number.

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

It is not a de Polignac number, because 1281103500561 - 2² = 1281103500557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1281103500571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296962030 + ... + 296966343.

It is an arithmetic number, because the mean of its divisors is an integer number (213814214640).

Almost surely, 2^{1281103500561} is an apocalyptic number.

It is an amenable number.

1281103500561 is a deficient number, since it is larger than the sum of its proper divisors (429410216559).

1281103500561 is an equidigital number, since it uses as much as digits as its factorization.

1281103500561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593929095.

The product of its (nonzero) digits is 7200, while the sum is 33.

The spelling of 1281103500561 in words is "one trillion, two hundred eighty-one billion, one hundred three million, five hundred thousand, five hundred sixty-one".