1201663 has 4 divisors (see below), whose sum is σ = 1210968. Its totient is φ = 1192360.

The previous prime is 1201643. The next prime is 1201687. The reversal of 1201663 is 3661021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201663 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 1201663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4456 + ... + 4717.

It is an arithmetic number, because the mean of its divisors is an integer number (302742).

2^1201663 is an apocalyptic number.

1201663 is a deficient number, since it is larger than the sum of its proper divisors (9305).

1201663 is an equidigital number, since it uses as much as digits as its factorization.

1201663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9304.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1201663 is about 1096.2039043901. The cubic root of 1201663 is about 106.3149231816.

Adding to 1201663 its reverse (3661021), we get a palindrome (4862684).

The spelling of 1201663 in words is "one million, two hundred one thousand, six hundred sixty-three".