3121841780 has 12 divisors (see below), whose sum is σ = 6555867780. Its totient is φ = 1248736704.

The previous prime is 3121841771. The next prime is 3121841783. The reversal of 3121841780 is 871481213.

It can be written as a sum of positive squares in 2 ways, for example, as 2455995364 + 665846416 = 49558^2 + 25804^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3121841780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121841783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78046025 + ... + 78046064.

It is an arithmetic number, because the mean of its divisors is an integer number (546322315).

Almost surely, 2^3121841780 is an apocalyptic number.

It is an amenable number.

3121841780 is an abundant number, since it is smaller than the sum of its proper divisors (3434026000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3121841780 is a wasteful number, since it uses less digits than its factorization.

3121841780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156092098 (or 156092096 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 3121841780 is about 55873.4443183880. Note that the first 3 decimals coincide. The cubic root of 3121841780 is about 1461.5161862263.

The spelling of 3121841780 in words is "three billion, one hundred twenty-one million, eight hundred forty-one thousand, seven hundred eighty".