1681419973 has 2 divisors, whose sum is σ = 1681419974. Its totient is φ = 1681419972.

The previous prime is 1681419967. The next prime is 1681419979. The reversal of 1681419973 is 3799141861.

It is a balanced prime because it is at equal distance from previous prime (1681419967) and next prime (1681419979).

It can be written as a sum of positive squares in only one way, i.e., 1669703044 + 11716929 = 40862^2 + 3423^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681419973 - 2⁹ = 1681419461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681419979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840709986 + 840709987.

It is an arithmetic number, because the mean of its divisors is an integer number (840709987).

Almost surely, 2^1681419973 is an apocalyptic number.

It is an amenable number.

1681419973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681419973 is an equidigital number, since it uses as much as digits as its factorization.

1681419973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 49.

The square root of 1681419973 is about 41005.1213021008. The cubic root of 1681419973 is about 1189.1192251500.

The spelling of 1681419973 in words is "one billion, six hundred eighty-one million, four hundred nineteen thousand, nine hundred seventy-three".