1331121232291 has 4 divisors (see below), whose sum is σ = 1331124742584. Its totient is φ = 1331117722000.

The previous prime is 1331121232289. The next prime is 1331121232327. The reversal of 1331121232291 is 1922321211331.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1331121232291 - 2¹ = 1331121232289 is a prime.

It is a super-2 number, since 2×1331121232291² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331121242291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1106410 + ... + 1971391.

It is an arithmetic number, because the mean of its divisors is an integer number (332781185646).

Almost surely, 2^{1331121232291} is an apocalyptic number.

1331121232291 is a deficient number, since it is larger than the sum of its proper divisors (3510293).

1331121232291 is an equidigital number, since it uses as much as digits as its factorization.

1331121232291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3510292.

The product of its digits is 3888, while the sum is 31.

The spelling of 1331121232291 in words is "one trillion, three hundred thirty-one billion, one hundred twenty-one million, two hundred thirty-two thousand, two hundred ninety-one".