1231231153 has 2 divisors, whose sum is σ = 1231231154. Its totient is φ = 1231231152.

The previous prime is 1231231151. The next prime is 1231231159. The reversal of 1231231153 is 3511321321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1004065969 + 227165184 = 31687^2 + 15072^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231231153 - 2¹ = 1231231151 is a prime.

Together with 1231231151, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1231231151) 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 as a sum of consecutive naturals, namely, 615615576 + 615615577.

It is an arithmetic number, because the mean of its divisors is an integer number (615615577).

Almost surely, 2^1231231153 is an apocalyptic number.

It is an amenable number.

1231231153 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231231153 is an equidigital number, since it uses as much as digits as its factorization.

1231231153 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 22.

The square root of 1231231153 is about 35088.9035593875. The cubic root of 1231231153 is about 1071.7986323637.

Adding to 1231231153 its reverse (3511321321), we get a palindrome (4742552474).

The spelling of 1231231153 in words is "one billion, two hundred thirty-one million, two hundred thirty-one thousand, one hundred fifty-three".