3109921656 has 128 divisors (see below), whose sum is σ = 8382528000. Its totient is φ = 958021632.

The previous prime is 3109921649. The next prime is 3109921679. The reversal of 3109921656 is 6561299013.

It is a super-2 number, since 2×3109921656² = 19343225412915564672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7083885 + ... + 7084323.

It is an arithmetic number, because the mean of its divisors is an integer number (65488500).

Almost surely, 2^3109921656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3109921656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4191264000).

3109921656 is an abundant number, since it is smaller than the sum of its proper divisors (5272606344).

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

3109921656 is a wasteful number, since it uses less digits than its factorization.

3109921656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741 (or 737 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 3109921656 is about 55766.6715521018. The cubic root of 3109921656 is about 1459.6536452445.

The spelling of 3109921656 in words is "three billion, one hundred nine million, nine hundred twenty-one thousand, six hundred fifty-six".