6631403 has 4 divisors (see below), whose sum is σ = 6671280. Its totient is φ = 6591528.

The previous prime is 6631379. The next prime is 6631409. The reversal of 6631403 is 3041366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3041366 = 2 ⋅1520683.

It is a cyclic number.

It is not a de Polignac number, because 6631403 - 2⁸ = 6631147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6631409) 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, 19688 + ... + 20021.

It is an arithmetic number, because the mean of its divisors is an integer number (1667820).

Almost surely, 2^6631403 is an apocalyptic number.

6631403 is a deficient number, since it is larger than the sum of its proper divisors (39877).

6631403 is a wasteful number, since it uses less digits than its factorization.

6631403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39876.

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

The square root of 6631403 is about 2575.1510635301. The cubic root of 6631403 is about 187.8747751408.

Adding to 6631403 its reverse (3041366), we get a palindrome (9672769).

The spelling of 6631403 in words is "six million, six hundred thirty-one thousand, four hundred three".