1813229647 has 2 divisors, whose sum is σ = 1813229648. Its totient is φ = 1813229646.

The previous prime is 1813229629. The next prime is 1813229651. The reversal of 1813229647 is 7469223181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1813229647 - 2⁷ = 1813229519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1813229657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906614823 + 906614824.

It is an arithmetic number, because the mean of its divisors is an integer number (906614824).

Almost surely, 2^1813229647 is an apocalyptic number.

1813229647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813229647 is an equidigital number, since it uses as much as digits as its factorization.

1813229647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 43.

The square root of 1813229647 is about 42582.0343220002. The cubic root of 1813229647 is about 1219.4133269470.

It can be divided in two parts, 181322 and 9647, that added together give a square (190969 = 437²).

The spelling of 1813229647 in words is "one billion, eight hundred thirteen million, two hundred twenty-nine thousand, six hundred forty-seven".