1316061561421 has 4 divisors (see below), whose sum is σ = 1324894189500. Its totient is φ = 1307228933344.

The previous prime is 1316061561407. The next prime is 1316061561433. The reversal of 1316061561421 is 1241651606131.

It is a happy number.

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 334475998921 + 981585562500 = 578339^2 + 990750^2 .

It is a cyclic number.

It is not a de Polignac number, because 1316061561421 - 2¹³ = 1316061553229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1316061561481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4416313816 + ... + 4416314113.

It is an arithmetic number, because the mean of its divisors is an integer number (331223547375).

Almost surely, 2^{1316061561421} is an apocalyptic number.

It is an amenable number.

1316061561421 is a deficient number, since it is larger than the sum of its proper divisors (8832628079).

1316061561421 is an equidigital number, since it uses as much as digits as its factorization.

1316061561421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8832628078.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 1316061561421 in words is "one trillion, three hundred sixteen billion, sixty-one million, five hundred sixty-one thousand, four hundred twenty-one".