3121145 has 4 divisors (see below), whose sum is σ = 3745380. Its totient is φ = 2496912.

The previous prime is 3121121. The next prime is 3121163. The reversal of 3121145 is 5411213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5411213 = 37 ⋅146249.

It can be written as a sum of positive squares in 2 ways, for example, as 1857769 + 1263376 = 1363^2 + 1124^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121145 - 2⁸ = 3120889 is a prime.

It is a super-3 number, since 3×3121145³ = 91214333810085370875, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312110 + ... + 312119.

It is an arithmetic number, because the mean of its divisors is an integer number (936345).

Almost surely, 2^3121145 is an apocalyptic number.

It is an amenable number.

3121145 is a deficient number, since it is larger than the sum of its proper divisors (624235).

3121145 is an equidigital number, since it uses as much as digits as its factorization.

3121145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624234.

The product of its digits is 120, while the sum is 17.

The square root of 3121145 is about 1766.6762578356. The cubic root of 3121145 is about 146.1407443685.

Adding to 3121145 its reverse (5411213), we get a palindrome (8532358).

The spelling of 3121145 in words is "three million, one hundred twenty-one thousand, one hundred forty-five".