2112305581 has 2 divisors, whose sum is σ = 2112305582. Its totient is φ = 2112305580.

The previous prime is 2112305549. The next prime is 2112305603. The reversal of 2112305581 is 1855032112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2111862025 + 443556 = 45955^2 + 666^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112305581 - 2⁵ = 2112305549 is a prime.

It is a super-2 number, since 2×2112305581² = 8923669735047495122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2112305501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056152790 + 1056152791.

It is an arithmetic number, because the mean of its divisors is an integer number (1056152791).

Almost surely, 2^2112305581 is an apocalyptic number.

It is an amenable number.

2112305581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2112305581 is an equidigital number, since it uses as much as digits as its factorization.

2112305581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 2112305581 is about 45959.8257285643. The cubic root of 2112305581 is about 1283.0756078998.

Adding to 2112305581 its reverse (1855032112), we get a palindrome (3967337693).

It can be divided in two parts, 211230 and 5581, that added together give a triangular number (216811 = T₆₅₈).

The spelling of 2112305581 in words is "two billion, one hundred twelve million, three hundred five thousand, five hundred eighty-one".