1663913 has 2 divisors, whose sum is σ = 1663914. Its totient is φ = 1663912.

The previous prime is 1663891. The next prime is 1663919. The reversal of 1663913 is 3193661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1420864 + 243049 = 1192^2 + 493^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663913 - 2¹² = 1659817 is a prime.

It is not a weakly prime, because it can be changed into another prime (1663919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831956 + 831957.

It is an arithmetic number, because the mean of its divisors is an integer number (831957).

2^1663913 is an apocalyptic number.

It is an amenable number.

1663913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663913 is an equidigital number, since it uses as much as digits as its factorization.

1663913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 29.

The square root of 1663913 is about 1289.9275173435. The cubic root of 1663913 is about 118.4977774987.

The spelling of 1663913 in words is "one million, six hundred sixty-three thousand, nine hundred thirteen".