631481 has 4 divisors (see below), whose sum is σ = 633600. Its totient is φ = 629364.

The previous prime is 631471. The next prime is 631483. The reversal of 631481 is 184136.

631481 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631481 is a prime.

It is a super-2 number, since 2×631481² = 797536506722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 631481.

It is not an unprimeable number, because it can be changed into a prime (631483) 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, 521 + ... + 1238.

It is an arithmetic number, because the mean of its divisors is an integer number (158400).

2⁶³¹⁴⁸¹ is an apocalyptic number.

It is an amenable number.

631481 is a deficient number, since it is larger than the sum of its proper divisors (2119).

631481 is a wasteful number, since it uses less digits than its factorization.

631481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2118.

The product of its digits is 576, while the sum is 23.

The square root of 631481 is about 794.6577879817. The cubic root of 631481 is about 85.7933111138.

The spelling of 631481 in words is "six hundred thirty-one thousand, four hundred eighty-one".