3121978290 has 32 divisors (see below), whose sum is σ = 7652171520. Its totient is φ = 814813824.

The previous prime is 3121978289. The next prime is 3121978309. The reversal of 3121978290 is 928791213.

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 15 ways as a sum of consecutive naturals, for example, 1105675 + ... + 1108494.

It is an arithmetic number, because the mean of its divisors is an integer number (239130360).

Almost surely, 2^3121978290 is an apocalyptic number.

3121978290 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

3121978290 is an abundant number, since it is smaller than the sum of its proper divisors (4530193230).

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

3121978290 is a wasteful number, since it uses less digits than its factorization.

3121978290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214226.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 3121978290 is about 55874.6659050414. The cubic root of 3121978290 is about 1461.5374886797.

The spelling of 3121978290 in words is "three billion, one hundred twenty-one million, nine hundred seventy-eight thousand, two hundred ninety".