1131231232031 has 4 divisors (see below), whose sum is σ = 1146727550352. Its totient is φ = 1115734913712.

The previous prime is 1131231232003. The next prime is 1131231232037. The reversal of 1131231232031 is 1302321321311.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131231232031 is a prime.

It is a super-2 number, since 2×1131231232031² (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 = 1131231231988 and 1131231232006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131231232037) 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, 7748159051 + ... + 7748159196.

It is an arithmetic number, because the mean of its divisors is an integer number (286681887588).

Almost surely, 2^{1131231232031} is an apocalyptic number.

1131231232031 is a deficient number, since it is larger than the sum of its proper divisors (15496318321).

1131231232031 is an equidigital number, since it uses as much as digits as its factorization.

1131231232031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15496318320.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1131231232031 its reverse (1302321321311), we get a palindrome (2433552553342).

The spelling of 1131231232031 in words is "one trillion, one hundred thirty-one billion, two hundred thirty-one million, two hundred thirty-two thousand, thirty-one".