1331320231231 has 4 divisors (see below), whose sum is σ = 1333286731512. Its totient is φ = 1329353730952.

The previous prime is 1331320231211. The next prime is 1331320231253. The reversal of 1331320231231 is 1321320231331.

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 1331320231231 - 2⁷ = 1331320231103 is a prime.

It is a super-2 number, since 2×1331320231231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331320231196 and 1331320231205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331320231201) 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, 983249125 + ... + 983250478.

It is an arithmetic number, because the mean of its divisors is an integer number (333321682878).

Almost surely, 2^{1331320231231} is an apocalyptic number.

1331320231231 is a deficient number, since it is larger than the sum of its proper divisors (1966500281).

1331320231231 is an equidigital number, since it uses as much as digits as its factorization.

1331320231231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966500280.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 1331320231231 its reverse (1321320231331), we get a palindrome (2652640462562).

The spelling of 1331320231231 in words is "one trillion, three hundred thirty-one billion, three hundred twenty million, two hundred thirty-one thousand, two hundred thirty-one".