1682815891 has 2 divisors, whose sum is σ = 1682815892. Its totient is φ = 1682815890.

The previous prime is 1682815853. The next prime is 1682815909. The reversal of 1682815891 is 1985182861.

It is a strong prime.

It is an emirp because it is prime and its reverse (1985182861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1682815891 - 2⁷ = 1682815763 is a prime.

It is not a weakly prime, because it can be changed into another prime (1682815831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 841407945 + 841407946.

It is an arithmetic number, because the mean of its divisors is an integer number (841407946).

Almost surely, 2^1682815891 is an apocalyptic number.

1682815891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1682815891 is an equidigital number, since it uses as much as digits as its factorization.

1682815891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 49.

The square root of 1682815891 is about 41022.1390349163. The cubic root of 1682815891 is about 1189.4482037939.

The spelling of 1682815891 in words is "one billion, six hundred eighty-two million, eight hundred fifteen thousand, eight hundred ninety-one".