3161861920 has 144 divisors (see below), whose sum is σ = 8694883008. Its totient is φ = 1064378880.

The previous prime is 3161861917. The next prime is 3161861987. The reversal of 3161861920 is 291681613.

3161861920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×3161861920² = 19994741602292172800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3161861920.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3898315 + ... + 3899125.

It is an arithmetic number, because the mean of its divisors is an integer number (60381132).

Almost surely, 2^3161861920 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 3161861920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4347441504).

3161861920 is an abundant number, since it is smaller than the sum of its proper divisors (5533021088).

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

3161861920 is an equidigital number, since it uses as much as digits as its factorization.

3161861920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951 (or 884 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 3161861920 is about 56230.4358866264. The cubic root of 3161861920 is about 1467.7349416389.

The spelling of 3161861920 in words is "three billion, one hundred sixty-one million, eight hundred sixty-one thousand, nine hundred twenty".