631109 has 6 divisors (see below), whose sum is σ = 650034. Its totient is φ = 612720.

The previous prime is 631061. The next prime is 631121. The reversal of 631109 is 901136.

It can be written as a sum of positive squares in 3 ways, for example, as 297025 + 334084 = 545^2 + 578^2 .

It is a de Polignac number, because none of the positive numbers 2^k-631109 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 (631139) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1139 + ... + 1599.

It is an arithmetic number, because the mean of its divisors is an integer number (108339).

2⁶³¹¹⁰⁹ is an apocalyptic number.

It is an amenable number.

631109 is a deficient number, since it is larger than the sum of its proper divisors (18925).

631109 is an equidigital number, since it uses as much as digits as its factorization.

631109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535 (or 498 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 631109 is about 794.4236904826. The cubic root of 631109 is about 85.7764611053.

The spelling of 631109 in words is "six hundred thirty-one thousand, one hundred nine".