1313563441921 has 2 divisors, whose sum is σ = 1313563441922. Its totient is φ = 1313563441920.

The previous prime is 1313563441913. The next prime is 1313563441973. The reversal of 1313563441921 is 1291443653131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 716553785025 + 597009656896 = 846495^2 + 772664^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313563441921 - 2³ = 1313563441913 is a prime.

It is not a weakly prime, because it can be changed into another prime (1313563471921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656781720960 + 656781720961.

It is an arithmetic number, because the mean of its divisors is an integer number (656781720961).

Almost surely, 2^{1313563441921} is an apocalyptic number.

It is an amenable number.

1313563441921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313563441921 is an equidigital number, since it uses as much as digits as its factorization.

1313563441921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 43.

The spelling of 1313563441921 in words is "one trillion, three hundred thirteen billion, five hundred sixty-three million, four hundred forty-one thousand, nine hundred twenty-one".