1781799023 has 2 divisors, whose sum is σ = 1781799024. Its totient is φ = 1781799022.

The previous prime is 1781799017. The next prime is 1781799073. The reversal of 1781799023 is 3209971871.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1781799023 - 2⁴ = 1781799007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1781799013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 890899511 + 890899512.

It is an arithmetic number, because the mean of its divisors is an integer number (890899512).

Almost surely, 2^1781799023 is an apocalyptic number.

1781799023 is a deficient number, since it is larger than the sum of its proper divisors (1).

1781799023 is an equidigital number, since it uses as much as digits as its factorization.

1781799023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 1781799023 is about 42211.3613023792. The cubic root of 1781799023 is about 1212.3264266787.

The spelling of 1781799023 in words is "one billion, seven hundred eighty-one million, seven hundred ninety-nine thousand, twenty-three".