3121734845 has 4 divisors (see below), whose sum is σ = 3746081820. Its totient is φ = 2497387872.

The previous prime is 3121734839. The next prime is 3121734883. The reversal of 3121734845 is 5484371213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5484371213 = 37 ⋅148226249.

It can be written as a sum of positive squares in 2 ways, for example, as 869188324 + 2252546521 = 29482^2 + 47461^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121734845 - 2¹² = 3121730749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3121734799 and 3121734808.

It is a congruent 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, 312173480 + ... + 312173489.

It is an arithmetic number, because the mean of its divisors is an integer number (936520455).

Almost surely, 2^3121734845 is an apocalyptic number.

It is an amenable number.

3121734845 is a deficient number, since it is larger than the sum of its proper divisors (624346975).

3121734845 is an equidigital number, since it uses as much as digits as its factorization.

3121734845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624346974.

The product of its digits is 80640, while the sum is 38.

The square root of 3121734845 is about 55872.4873707982. The cubic root of 3121734845 is about 1461.4994985326.

The spelling of 3121734845 in words is "three billion, one hundred twenty-one million, seven hundred thirty-four thousand, eight hundred forty-five".