1231131033 has 24 divisors (see below), whose sum is σ = 1950829920. Its totient is φ = 741960960.

The previous prime is 1231131029. The next prime is 1231131047. The reversal of 1231131033 is 3301311321.

It is a happy number.

1231131033 is a `hidden beast` number, since 12 + 311 + 310 + 33 = 666.

It is not a de Polignac number, because 1231131033 - 2² = 1231131029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231130997 and 1231131015.

It is not an unprimeable number, because it can be changed into a prime (1231131073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17016 + ... + 52457.

It is an arithmetic number, because the mean of its divisors is an integer number (81284580).

Almost surely, 2^1231131033 is an apocalyptic number.

It is an amenable number.

1231131033 is a deficient number, since it is larger than the sum of its proper divisors (719698887).

1231131033 is a wasteful number, since it uses less digits than its factorization.

1231131033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69669 (or 69666 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 1231131033 is about 35087.4768685353. The cubic root of 1231131033 is about 1071.7695797666.

Adding to 1231131033 its reverse (3301311321), we get a palindrome (4532442354).

The spelling of 1231131033 in words is "one billion, two hundred thirty-one million, one hundred thirty-one thousand, thirty-three".