631108409 has 4 divisors (see below), whose sum is σ = 631205604. Its totient is φ = 631011216.

The previous prime is 631108403. The next prime is 631108417. The reversal of 631108409 is 904801136.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 277555600 + 353552809 = 16660^2 + 18803^2 .

It is a cyclic number.

It is not a de Polignac number, because 631108409 - 2⁴ = 631108393 is a prime.

It is a super-2 number, since 2×631108409² = 796595647821022562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631108403) 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, 38102 + ... + 52095.

It is an arithmetic number, because the mean of its divisors is an integer number (157801401).

Almost surely, 2^631108409 is an apocalyptic number.

It is an amenable number.

631108409 is a deficient number, since it is larger than the sum of its proper divisors (97195).

631108409 is an equidigital number, since it uses as much as digits as its factorization.

631108409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97194.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 631108409 is about 25121.8711285605. The cubic root of 631108409 is about 857.7643433023.

The spelling of 631108409 in words is "six hundred thirty-one million, one hundred eight thousand, four hundred nine".