1331448154561 has 4 divisors (see below), whose sum is σ = 1521655033792. Its totient is φ = 1141241275332.

The previous prime is 1331448154537. The next prime is 1331448154567. The reversal of 1331448154561 is 1654518441331.

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 1331448154561 - 2¹¹ = 1331448152513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331448154567) 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, 95103439605 + ... + 95103439618.

It is an arithmetic number, because the mean of its divisors is an integer number (380413758448).

Almost surely, 2^{1331448154561} is an apocalyptic number.

It is an amenable number.

1331448154561 is a deficient number, since it is larger than the sum of its proper divisors (190206879231).

1331448154561 is an equidigital number, since it uses as much as digits as its factorization.

1331448154561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190206879230.

The product of its digits is 691200, while the sum is 46.

The spelling of 1331448154561 in words is "one trillion, three hundred thirty-one billion, four hundred forty-eight million, one hundred fifty-four thousand, five hundred sixty-one".