1663501 has 12 divisors (see below), whose sum is σ = 2049948. Its totient is φ = 1341312.

The previous prime is 1663481. The next prime is 1663513. The reversal of 1663501 is 1053661.

It can be written as a sum of positive squares in 2 ways, for example, as 561001 + 1102500 = 749^2 + 1050^2 .

It is not a de Polignac number, because 1663501 - 2⁷ = 1663373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 166 + ... + 1831.

It is an arithmetic number, because the mean of its divisors is an integer number (170829).

2^1663501 is an apocalyptic number.

It is an amenable number.

1663501 is a deficient number, since it is larger than the sum of its proper divisors (386447).

1663501 is a wasteful number, since it uses less digits than its factorization.

1663501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2028 (or 2021 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 1663501 is about 1289.7678085609. The cubic root of 1663501 is about 118.4879963154.

The spelling of 1663501 in words is "one million, six hundred sixty-three thousand, five hundred one".