1231130239 has 2 divisors, whose sum is σ = 1231130240. Its totient is φ = 1231130238.

The previous prime is 1231130237. The next prime is 1231130261. The reversal of 1231130239 is 9320311321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231130239 - 2¹ = 1231130237 is a prime.

Together with 1231130237, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231130237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615565119 + 615565120.

It is an arithmetic number, because the mean of its divisors is an integer number (615565120).

Almost surely, 2^1231130239 is an apocalyptic number.

1231130239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231130239 is an equidigital number, since it uses as much as digits as its factorization.

1231130239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 1231130239 is about 35087.4655539553. The cubic root of 1231130239 is about 1071.7693493592.

The spelling of 1231130239 in words is "one billion, two hundred thirty-one million, one hundred thirty thousand, two hundred thirty-nine".