663431 has 4 divisors (see below), whose sum is σ = 684864. Its totient is φ = 642000.

The previous prime is 663409. The next prime is 663437. The reversal of 663431 is 134366.

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

It is a cyclic number.

It is not a de Polignac number, because 663431 - 2¹⁰ = 662407 is a prime.

It is a super-2 number, since 2×663431² = 880281383522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 663397 and 663406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10670 + ... + 10731.

It is an arithmetic number, because the mean of its divisors is an integer number (171216).

2⁶⁶³⁴³¹ is an apocalyptic number.

663431 is a deficient number, since it is larger than the sum of its proper divisors (21433).

663431 is a wasteful number, since it uses less digits than its factorization.

663431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21432.

The product of its digits is 1296, while the sum is 23.

The square root of 663431 is about 814.5127377764. The cubic root of 663431 is about 87.2164864460.

Adding to 663431 its reverse (134366), we get a palindrome (797797).

The spelling of 663431 in words is "six hundred sixty-three thousand, four hundred thirty-one".