31105105 has 8 divisors (see below), whose sum is σ = 37356264. Its totient is φ = 24864000.

The previous prime is 31105097. The next prime is 31105111. The reversal of 31105105 is 50150113.

It can be written as a sum of positive squares in 4 ways, for example, as 5125696 + 25979409 = 2264^2 + 5097^2 .

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

It is not a de Polignac number, because 31105105 - 2³ = 31105097 is a prime.

It is a super-2 number, since 2×31105105² = 1935055114122050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9705 + ... + 12505.

It is an arithmetic number, because the mean of its divisors is an integer number (4669533).

Almost surely, 2^31105105 is an apocalyptic number.

It is an amenable number.

31105105 is a deficient number, since it is larger than the sum of its proper divisors (6251159).

31105105 is a wasteful number, since it uses less digits than its factorization.

31105105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5027.

The product of its (nonzero) digits is 75, while the sum is 16.

The square root of 31105105 is about 5577.1950835523. The cubic root of 31105105 is about 314.4926914369.

Adding to 31105105 its reverse (50150113), we get a palindrome (81255218).

The spelling of 31105105 in words is "thirty-one million, one hundred five thousand, one hundred five".