1230819281 has 2 divisors, whose sum is σ = 1230819282. Its totient is φ = 1230819280.

The previous prime is 1230819253. The next prime is 1230819283. The reversal of 1230819281 is 1829180321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 977500225 + 253319056 = 31265^2 + 15916^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230819281 - 2¹⁴ = 1230802897 is a prime.

It is a super-2 number, since 2×1230819281² = 3029832204962713922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1230819283, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1230819283) 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, 615409640 + 615409641.

It is an arithmetic number, because the mean of its divisors is an integer number (615409641).

Almost surely, 2^1230819281 is an apocalyptic number.

It is an amenable number.

1230819281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1230819281 is an equidigital number, since it uses as much as digits as its factorization.

1230819281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 1230819281 is about 35083.0340905686. The cubic root of 1230819281 is about 1071.6791061810.

The spelling of 1230819281 in words is "one billion, two hundred thirty million, eight hundred nineteen thousand, two hundred eighty-one".