631749 has 8 divisors (see below), whose sum is σ = 869632. Its totient is φ = 407520.

The previous prime is 631739. The next prime is 631751. The reversal of 631749 is 947136.

It is a happy number.

631749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 631749 - 2⁴ = 631733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631739) 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, 3304 + ... + 3489.

It is an arithmetic number, because the mean of its divisors is an integer number (108704).

2⁶³¹⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

631749 is a deficient number, since it is larger than the sum of its proper divisors (237883).

631749 is a wasteful number, since it uses less digits than its factorization.

631749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6827.

The product of its digits is 4536, while the sum is 30.

The square root of 631749 is about 794.8263961394. The cubic root of 631749 is about 85.8054462667.

The spelling of 631749 in words is "six hundred thirty-one thousand, seven hundred forty-nine".