3122161561 has 2 divisors, whose sum is σ = 3122161562. Its totient is φ = 3122161560.

The previous prime is 3122161531. The next prime is 3122161697. The reversal of 3122161561 is 1651612213.

3122161561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3081915225 + 40246336 = 55515^2 + 6344^2 .

It is an emirp because it is prime and its reverse (1651612213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3122161561 - 2¹⁹ = 3121637273 is a prime.

It is not a weakly prime, because it can be changed into another prime (3122161531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1561080780 + 1561080781.

It is an arithmetic number, because the mean of its divisors is an integer number (1561080781).

Almost surely, 2^3122161561 is an apocalyptic number.

It is an amenable number.

3122161561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3122161561 is an equidigital number, since it uses as much as digits as its factorization.

3122161561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 3122161561 is about 55876.3058997282. The cubic root of 3122161561 is about 1461.5660872338.

Adding to 3122161561 its reverse (1651612213), we get a palindrome (4773773774).

The spelling of 3122161561 in words is "three billion, one hundred twenty-two million, one hundred sixty-one thousand, five hundred sixty-one".