3161861917 has 2 divisors, whose sum is σ = 3161861918. Its totient is φ = 3161861916.

The previous prime is 3161861897. The next prime is 3161861987. The reversal of 3161861917 is 7191681613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3160575961 + 1285956 = 56219^2 + 1134^2 .

It is a cyclic number.

It is not a de Polignac number, because 3161861917 - 2¹⁵ = 3161829149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3161861987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1580930958 + 1580930959.

It is an arithmetic number, because the mean of its divisors is an integer number (1580930959).

Almost surely, 2^3161861917 is an apocalyptic number.

It is an amenable number.

3161861917 is a deficient number, since it is larger than the sum of its proper divisors (1).

3161861917 is an equidigital number, since it uses as much as digits as its factorization.

3161861917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 43.

The square root of 3161861917 is about 56230.4358599504. The cubic root of 3161861917 is about 1467.7349411747.

The spelling of 3161861917 in words is "three billion, one hundred sixty-one million, eight hundred sixty-one thousand, nine hundred seventeen".