1915663 has 2 divisors, whose sum is σ = 1915664. Its totient is φ = 1915662.

The previous prime is 1915649. The next prime is 1915687. The reversal of 1915663 is 3665191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1915663 - 2¹³ = 1907471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1915633) 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, 957831 + 957832.

It is an arithmetic number, because the mean of its divisors is an integer number (957832).

2^1915663 is an apocalyptic number.

1915663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1915663 is an equidigital number, since it uses as much as digits as its factorization.

1915663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 31.

The square root of 1915663 is about 1384.0747812167. The cubic root of 1915663 is about 124.1956458843.

The spelling of 1915663 in words is "one million, nine hundred fifteen thousand, six hundred sixty-three".