631491 has 8 divisors (see below), whose sum is σ = 962304. Its totient is φ = 360840.

The previous prime is 631487. The next prime is 631507. The reversal of 631491 is 194136.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 631491 - 2² = 631487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15015 + ... + 15056.

It is an arithmetic number, because the mean of its divisors is an integer number (120288).

2⁶³¹⁴⁹¹ is an apocalyptic number.

631491 is a deficient number, since it is larger than the sum of its proper divisors (330813).

631491 is a wasteful number, since it uses less digits than its factorization.

631491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30081.

The product of its digits is 648, while the sum is 24.

The square root of 631491 is about 794.6640799734. The cubic root of 631491 is about 85.7937639797.

The spelling of 631491 in words is "six hundred thirty-one thousand, four hundred ninety-one".