3121485820 has 24 divisors (see below), whose sum is σ = 6566052528. Its totient is φ = 1246512000.

The previous prime is 3121485811. The next prime is 3121485823. The reversal of 3121485820 is 285841213.

It is a happy number.

It is a super-2 number, since 2×3121485820² = 19487347448922144800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121485823) 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, 117826 + ... + 141865.

It is an arithmetic number, because the mean of its divisors is an integer number (273585522).

Almost surely, 2^3121485820 is an apocalyptic number.

It is an amenable number.

3121485820 is an abundant number, since it is smaller than the sum of its proper divisors (3444566708).

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

3121485820 is a wasteful number, since it uses less digits than its factorization.

3121485820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260301 (or 260299 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 3121485820 is about 55870.2588145070. The cubic root of 3121485820 is about 1461.4606355704.

The spelling of 3121485820 in words is "three billion, one hundred twenty-one million, four hundred eighty-five thousand, eight hundred twenty".