3181618061 has 2 divisors, whose sum is σ = 3181618062. Its totient is φ = 3181618060.

The previous prime is 3181618021. The next prime is 3181618087. The reversal of 3181618061 is 1608161813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3049137961 + 132480100 = 55219^2 + 11510^2 .

It is an emirp because it is prime and its reverse (1608161813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3181618061 - 2⁶ = 3181617997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3181618021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1590809030 + 1590809031.

It is an arithmetic number, because the mean of its divisors is an integer number (1590809031).

Almost surely, 2^3181618061 is an apocalyptic number.

It is an amenable number.

3181618061 is a deficient number, since it is larger than the sum of its proper divisors (1).

3181618061 is an equidigital number, since it uses as much as digits as its factorization.

3181618061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 3181618061 is about 56405.8335724240. The cubic root of 3181618061 is about 1470.7855275286.

Adding to 3181618061 its reverse (1608161813), we get a palindrome (4789779874).

The spelling of 3181618061 in words is "three billion, one hundred eighty-one million, six hundred eighteen thousand, sixty-one".