3121042305 has 16 divisors (see below), whose sum is σ = 5006514240. Its totient is φ = 1660273728.

The previous prime is 3121042289. The next prime is 3121042313. The reversal of 3121042305 is 5032401213.

It is not a de Polignac number, because 3121042305 - 2⁴ = 3121042289 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261607 + ... + 273276.

It is an arithmetic number, because the mean of its divisors is an integer number (312907140).

Almost surely, 2^3121042305 is an apocalyptic number.

It is an amenable number.

3121042305 is a deficient number, since it is larger than the sum of its proper divisors (1885471935).

3121042305 is a wasteful number, since it uses less digits than its factorization.

3121042305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535280.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 3121042305 is about 55866.2895223945. The cubic root of 3121042305 is about 1461.3914152853.

Adding to 3121042305 its reverse (5032401213), we get a palindrome (8153443518).

The spelling of 3121042305 in words is "three billion, one hundred twenty-one million, forty-two thousand, three hundred five".