631447 has 4 divisors (see below), whose sum is σ = 639520. Its totient is φ = 623376.

The previous prime is 631429. The next prime is 631453. The reversal of 631447 is 744136.

631447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631457) 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, 3918 + ... + 4075.

It is an arithmetic number, because the mean of its divisors is an integer number (159880).

2⁶³¹⁴⁴⁷ is an apocalyptic number.

631447 is a deficient number, since it is larger than the sum of its proper divisors (8073).

631447 is an equidigital number, since it uses as much as digits as its factorization.

631447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8072.

The product of its digits is 2016, while the sum is 25.

The square root of 631447 is about 794.6363948373. The cubic root of 631447 is about 85.7917713341.

The spelling of 631447 in words is "six hundred thirty-one thousand, four hundred forty-seven".