1663145 has 12 divisors (see below), whose sum is σ = 2194500. Its totient is φ = 1209120.

The previous prime is 1663133. The next prime is 1663147. The reversal of 1663145 is 5413661.

It can be written as a sum of positive squares in 2 ways, for example, as 379456 + 1283689 = 616^2 + 1133^2 .

It is not a de Polignac number, because 1663145 - 2¹⁰ = 1662121 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1663147) 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, 770 + ... + 1979.

It is an arithmetic number, because the mean of its divisors is an integer number (182875).

2^1663145 is an apocalyptic number.

It is an amenable number.

1663145 is a deficient number, since it is larger than the sum of its proper divisors (531355).

1663145 is a wasteful number, since it uses less digits than its factorization.

1663145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2776 (or 2765 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 1663145 is about 1289.6297918395. The cubic root of 1663145 is about 118.4795433125.

The spelling of 1663145 in words is "one million, six hundred sixty-three thousand, one hundred forty-five".