1331491388641 has 4 divisors (see below), whose sum is σ = 1401569882800. Its totient is φ = 1261412894484.

The previous prime is 1331491388629. The next prime is 1331491388743. The reversal of 1331491388641 is 1468831941331.

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 1331491388641 - 2²⁹ = 1330954517729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331491388621) 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 3 ways as a sum of consecutive naturals, for example, 35039247051 + ... + 35039247088.

It is an arithmetic number, because the mean of its divisors is an integer number (350392470700).

Almost surely, 2^{1331491388641} is an apocalyptic number.

It is an amenable number.

1331491388641 is a deficient number, since it is larger than the sum of its proper divisors (70078494159).

1331491388641 is an equidigital number, since it uses as much as digits as its factorization.

1331491388641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70078494158.

The product of its digits is 1492992, while the sum is 52.

The spelling of 1331491388641 in words is "one trillion, three hundred thirty-one billion, four hundred ninety-one million, three hundred eighty-eight thousand, six hundred forty-one".