1681420423 has 2 divisors, whose sum is σ = 1681420424. Its totient is φ = 1681420422.

The previous prime is 1681420421. The next prime is 1681420457. The reversal of 1681420423 is 3240241861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1681420423 - 2¹ = 1681420421 is a prime.

Together with 1681420421, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681420421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840710211 + 840710212.

It is an arithmetic number, because the mean of its divisors is an integer number (840710212).

Almost surely, 2^1681420423 is an apocalyptic number.

1681420423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681420423 is an equidigital number, since it uses as much as digits as its factorization.

1681420423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 1681420423 is about 41005.1267892199. The cubic root of 1681420423 is about 1189.1193312317.

The spelling of 1681420423 in words is "one billion, six hundred eighty-one million, four hundred twenty thousand, four hundred twenty-three".