631747 has 4 divisors (see below), whose sum is σ = 633640. Its totient is φ = 629856.

The previous prime is 631739. The next prime is 631751. The reversal of 631747 is 747136.

631747 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 5-Lehmer number, since φ(631747) divides (631747-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 631747 - 2³ = 631739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631717) 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, 297 + ... + 1162.

It is an arithmetic number, because the mean of its divisors is an integer number (158410).

2⁶³¹⁷⁴⁷ is an apocalyptic number.

631747 is a deficient number, since it is larger than the sum of its proper divisors (1893).

631747 is a wasteful number, since it uses less digits than its factorization.

631747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1892.

The product of its digits is 3528, while the sum is 28.

The square root of 631747 is about 794.8251380021. The cubic root of 631747 is about 85.8053557186.

It can be divided in two parts, 631 and 747, that added together give a triangular number (1378 = T₅₂).

The spelling of 631747 in words is "six hundred thirty-one thousand, seven hundred forty-seven".