663481 has 16 divisors (see below), whose sum is σ = 854784. Its totient is φ = 500544.

The previous prime is 663463. The next prime is 663517. The reversal of 663481 is 184366.

It is a cyclic number.

It is not a de Polignac number, because 663481 - 2¹³ = 655289 is a prime.

It is a super-2 number, since 2×663481² = 880414074722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (663281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1935 + ... + 2251.

It is an arithmetic number, because the mean of its divisors is an integer number (53424).

2⁶⁶³⁴⁸¹ is an apocalyptic number.

It is an amenable number.

663481 is a deficient number, since it is larger than the sum of its proper divisors (191303).

663481 is a wasteful number, since it uses less digits than its factorization.

663481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360.

The product of its digits is 3456, while the sum is 28.

The square root of 663481 is about 814.5434303952. The cubic root of 663481 is about 87.2186774373.

The spelling of 663481 in words is "six hundred sixty-three thousand, four hundred eighty-one".