3161621813 has 4 divisors (see below), whose sum is σ = 3613282080. Its totient is φ = 2709961548.

The previous prime is 3161621797. The next prime is 3161621821. The reversal of 3161621813 is 3181261613.

3161621813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3161621813 - 2⁴ = 3161621797 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3161621813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3161621833) 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, 225830123 + ... + 225830136.

It is an arithmetic number, because the mean of its divisors is an integer number (903320520).

Almost surely, 2^3161621813 is an apocalyptic number.

It is an amenable number.

3161621813 is a deficient number, since it is larger than the sum of its proper divisors (451660267).

3161621813 is an equidigital number, since it uses as much as digits as its factorization.

3161621813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451660266.

The product of its digits is 5184, while the sum is 32.

The square root of 3161621813 is about 56228.3008190715. The cubic root of 3161621813 is about 1467.6977881765.

The spelling of 3161621813 in words is "three billion, one hundred sixty-one million, six hundred twenty-one thousand, eight hundred thirteen".