1781816423 has 2 divisors, whose sum is σ = 1781816424. Its totient is φ = 1781816422.

The previous prime is 1781816303. The next prime is 1781816429. The reversal of 1781816423 is 3246181871.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1781816423 - 2⁸ = 1781816167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1781816429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 890908211 + 890908212.

It is an arithmetic number, because the mean of its divisors is an integer number (890908212).

Almost surely, 2^1781816423 is an apocalyptic number.

1781816423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1781816423 is an equidigital number, since it uses as much as digits as its factorization.

1781816423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 41.

The square root of 1781816423 is about 42211.5674075247. The cubic root of 1781816423 is about 1212.3303729545.

The spelling of 1781816423 in words is "one billion, seven hundred eighty-one million, eight hundred sixteen thousand, four hundred twenty-three".