3121105 has 8 divisors (see below), whose sum is σ = 4033512. Its totient is φ = 2304768.

The previous prime is 3121091. The next prime is 3121109. The reversal of 3121105 is 5011213.

It can be written as a sum of positive squares in 4 ways, for example, as 9409 + 3111696 = 97^2 + 1764^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 3121105 - 2⁷ = 3120977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3121109) 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, 23944 + ... + 24073.

It is an arithmetic number, because the mean of its divisors is an integer number (504189).

Almost surely, 2^3121105 is an apocalyptic number.

It is an amenable number.

3121105 is a deficient number, since it is larger than the sum of its proper divisors (912407).

3121105 is a wasteful number, since it uses less digits than its factorization.

3121105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48035.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 3121105 is about 1766.6649371061. The cubic root of 3121105 is about 146.1401200619.

Adding to 3121105 its reverse (5011213), we get a palindrome (8132318).

The spelling of 3121105 in words is "three million, one hundred twenty-one thousand, one hundred five".