1663231 has 4 divisors (see below), whose sum is σ = 1678600. Its totient is φ = 1647864.

The previous prime is 1663223. The next prime is 1663267. The reversal of 1663231 is 1323661.

1663231 = 524² + 525² + ... + 529².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1323661 = 47 ⋅28163.

It is a cyclic number.

It is not a de Polignac number, because 1663231 - 2³ = 1663223 is a prime.

It is a super-2 number, since 2×1663231² = 5532674718722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7521 + ... + 7738.

It is an arithmetic number, because the mean of its divisors is an integer number (419650).

2^1663231 is an apocalyptic number.

1663231 is a deficient number, since it is larger than the sum of its proper divisors (15369).

1663231 is a wasteful number, since it uses less digits than its factorization.

1663231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15368.

The product of its digits is 648, while the sum is 22.

The square root of 1663231 is about 1289.6631343107. The cubic root of 1663231 is about 118.4815854405.

Adding to 1663231 its reverse (1323661), we get a palindrome (2986892).

The spelling of 1663231 in words is "one million, six hundred sixty-three thousand, two hundred thirty-one".