1231169113 has 2 divisors, whose sum is σ = 1231169114. Its totient is φ = 1231169112.

The previous prime is 1231169099. The next prime is 1231169141. The reversal of 1231169113 is 3119611321.

It is an a-pointer prime, because the next prime (1231169141) can be obtained adding 1231169113 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1231167744 + 1369 = 35088^2 + 37^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231169113 - 2⁵ = 1231169081 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231169213) 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, 615584556 + 615584557.

It is an arithmetic number, because the mean of its divisors is an integer number (615584557).

Almost surely, 2^1231169113 is an apocalyptic number.

It is an amenable number.

1231169113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231169113 is an equidigital number, since it uses as much as digits as its factorization.

1231169113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 28.

The square root of 1231169113 is about 35088.0195080885. The cubic root of 1231169113 is about 1071.7806299212.

The spelling of 1231169113 in words is "one billion, two hundred thirty-one million, one hundred sixty-nine thousand, one hundred thirteen".