1231365133 has 2 divisors, whose sum is σ = 1231365134. Its totient is φ = 1231365132.

The previous prime is 1231365101. The next prime is 1231365137. The reversal of 1231365133 is 3315631321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 727003369 + 504361764 = 26963^2 + 22458^2 .

It is an emirp because it is prime and its reverse (3315631321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231365133 - 2⁵ = 1231365101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231365137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615682566 + 615682567.

It is an arithmetic number, because the mean of its divisors is an integer number (615682567).

Almost surely, 2^1231365133 is an apocalyptic number.

It is an amenable number.

1231365133 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231365133 is an equidigital number, since it uses as much as digits as its factorization.

1231365133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 28.

The square root of 1231365133 is about 35090.8126580163. The cubic root of 1231365133 is about 1071.8375079158.

Adding to 1231365133 its reverse (3315631321), we get a palindrome (4546996454).

The spelling of 1231365133 in words is "one billion, two hundred thirty-one million, three hundred sixty-five thousand, one hundred thirty-three".