31105085 has 32 divisors (see below), whose sum is σ = 43241472. Its totient is φ = 21257280.

The previous prime is 31105057. The next prime is 31105097. The reversal of 31105085 is 58050113.

It is not a de Polignac number, because 31105085 - 2⁶ = 31105021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31105085.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84572 + ... + 84938.

It is an arithmetic number, because the mean of its divisors is an integer number (1351296).

Almost surely, 2^31105085 is an apocalyptic number.

It is an amenable number.

31105085 is a deficient number, since it is larger than the sum of its proper divisors (12136387).

31105085 is a wasteful number, since it uses less digits than its factorization.

31105085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 31105085 is about 5577.1932905360. The cubic root of 31105085 is about 314.4926240326.

Adding to 31105085 its reverse (58050113), we get a palindrome (89155198).

The spelling of 31105085 in words is "thirty-one million, one hundred five thousand, eighty-five".