1313087443961 has 4 divisors (see below), whose sum is σ = 1313735244432. Its totient is φ = 1312439643492.

The previous prime is 1313087443937. The next prime is 1313087443979. The reversal of 1313087443961 is 1693447803131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1313087443961 - 2³⁰ = 1312013702137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1313087443061) 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, 323897195 + ... + 323901248.

It is an arithmetic number, because the mean of its divisors is an integer number (328433811108).

Almost surely, 2^{1313087443961} is an apocalyptic number.

It is an amenable number.

1313087443961 is a deficient number, since it is larger than the sum of its proper divisors (647800471).

1313087443961 is an equidigital number, since it uses as much as digits as its factorization.

1313087443961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647800470.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 1313087443961 in words is "one trillion, three hundred thirteen billion, eighty-seven million, four hundred forty-three thousand, nine hundred sixty-one".