1231378283 has 2 divisors, whose sum is σ = 1231378284. Its totient is φ = 1231378282.

The previous prime is 1231378271. The next prime is 1231378303. The reversal of 1231378283 is 3828731321.

It is a weak prime.

It is an emirp because it is prime and its reverse (3828731321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231378283 - 2³⁰ = 157636459 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231378243) 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, 615689141 + 615689142.

It is an arithmetic number, because the mean of its divisors is an integer number (615689142).

Almost surely, 2^1231378283 is an apocalyptic number.

1231378283 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231378283 is an equidigital number, since it uses as much as digits as its factorization.

1231378283 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 38.

The square root of 1231378283 is about 35091.0000284973. Note that the first 4 decimals coincide. The cubic root of 1231378283 is about 1071.8413233595.

The spelling of 1231378283 in words is "one billion, two hundred thirty-one million, three hundred seventy-eight thousand, two hundred eighty-three".