1231400133 has 6 divisors (see below), whose sum is σ = 1778689094. Its totient is φ = 820933416.

The previous prime is 1231400129. The next prime is 1231400143. The reversal of 1231400133 is 3310041321.

1231400133 is a `hidden beast` number, since 1 + 231 + 400 + 1 + 33 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1139872644 + 91527489 = 33762^2 + 9567^2 .

It is not a de Polignac number, because 1231400133 - 2² = 1231400129 is a prime.

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 (1231400113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68411110 + ... + 68411127.

Almost surely, 2^1231400133 is an apocalyptic number.

It is an amenable number.

1231400133 is a deficient number, since it is larger than the sum of its proper divisors (547288961).

1231400133 is a wasteful number, since it uses less digits than its factorization.

1231400133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136822243 (or 136822240 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1231400133 is about 35091.3113605063. The cubic root of 1231400133 is about 1071.8476630291.

Adding to 1231400133 its reverse (3310041321), we get a palindrome (4541441454).

The spelling of 1231400133 in words is "one billion, two hundred thirty-one million, four hundred thousand, one hundred thirty-three".