1231231133 has 8 divisors (see below), whose sum is σ = 1344099360. Its totient is φ = 1118519280.

The previous prime is 1231231121. The next prime is 1231231151. The reversal of 1231231133 is 3311321321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231231133 - 2¹⁸ = 1230968989 is a prime.

It is a super-3 number, since 3×1231231133³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231231153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22310 + ... + 54407.

It is an arithmetic number, because the mean of its divisors is an integer number (168012420).

Almost surely, 2^1231231133 is an apocalyptic number.

It is an amenable number.

1231231133 is a deficient number, since it is larger than the sum of its proper divisors (112868227).

1231231133 is a wasteful number, since it uses less digits than its factorization.

1231231133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78187.

The product of its digits is 324, while the sum is 20.

The square root of 1231231133 is about 35088.9032743972. The cubic root of 1231231133 is about 1071.7986265603.

Adding to 1231231133 its reverse (3311321321), we get a palindrome (4542552454).

The spelling of 1231231133 in words is "one billion, two hundred thirty-one million, two hundred thirty-one thousand, one hundred thirty-three".