1663313 has 4 divisors (see below), whose sum is σ = 1671408. Its totient is φ = 1655220.

The previous prime is 1663309. The next prime is 1663327. The reversal of 1663313 is 3133661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3133661 = 17 ⋅184333.

It is a cyclic number.

It is not a de Polignac number, because 1663313 - 2² = 1663309 is a prime.

It is a super-2 number, since 2×1663313² = 5533220271938, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1663303) 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, 3731 + ... + 4152.

It is an arithmetic number, because the mean of its divisors is an integer number (417852).

2^1663313 is an apocalyptic number.

It is an amenable number.

1663313 is a deficient number, since it is larger than the sum of its proper divisors (8095).

1663313 is an equidigital number, since it uses as much as digits as its factorization.

1663313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8094.

The product of its digits is 972, while the sum is 23.

The square root of 1663313 is about 1289.6949251664. The cubic root of 1663313 is about 118.4835325203.

Adding to 1663313 its reverse (3133661), we get a palindrome (4796974).

The spelling of 1663313 in words is "one million, six hundred sixty-three thousand, three hundred thirteen".