1316220521045 has 4 divisors (see below), whose sum is σ = 1579464625260. Its totient is φ = 1052976416832.

The previous prime is 1316220521041. The next prime is 1316220521107. The reversal of 1316220521045 is 5401250226131.

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 205991622769 + 1110228898276 = 453863^2 + 1053674^2 .

It is a cyclic number.

It is not a de Polignac number, because 1316220521045 - 2² = 1316220521041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1316220521041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131622052100 + ... + 131622052109.

It is an arithmetic number, because the mean of its divisors is an integer number (394866156315).

Almost surely, 2^{1316220521045} is an apocalyptic number.

It is an amenable number.

1316220521045 is a deficient number, since it is larger than the sum of its proper divisors (263244104215).

1316220521045 is an equidigital number, since it uses as much as digits as its factorization.

1316220521045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263244104214.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 1316220521045 its reverse (5401250226131), we get a palindrome (6717470747176).

The spelling of 1316220521045 in words is "one trillion, three hundred sixteen billion, two hundred twenty million, five hundred twenty-one thousand, forty-five".