1663291 has 8 divisors (see below), whose sum is σ = 1983744. Its totient is φ = 1363560.

The previous prime is 1663289. The next prime is 1663301. The reversal of 1663291 is 1923661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1663291 - 2¹ = 1663289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1663091) 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 in 7 ways as a sum of consecutive naturals, for example, 5005 + ... + 5326.

It is an arithmetic number, because the mean of its divisors is an integer number (247968).

2^1663291 is an apocalyptic number.

1663291 is a deficient number, since it is larger than the sum of its proper divisors (320453).

1663291 is a wasteful number, since it uses less digits than its factorization.

1663291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10361.

The product of its digits is 1944, while the sum is 28.

The square root of 1663291 is about 1289.6863959894. The cubic root of 1663291 is about 118.4830101394.

The spelling of 1663291 in words is "one million, six hundred sixty-three thousand, two hundred ninety-one".