611110081 has 2 divisors, whose sum is σ = 611110082. Its totient is φ = 611110080.

The previous prime is 611110079. The next prime is 611110147. The reversal of 611110081 is 180011116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 351900081 + 259210000 = 18759^2 + 16100^2 .

It is a cyclic number.

It is not a de Polignac number, because 611110081 - 2¹ = 611110079 is a prime.

It is a super-2 number, since 2×611110081² = 746911062199653122, which contains 22 as substring.

Together with 611110079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (611110001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305555040 + 305555041.

It is an arithmetic number, because the mean of its divisors is an integer number (305555041).

Almost surely, 2^611110081 is an apocalyptic number.

It is an amenable number.

611110081 is a deficient number, since it is larger than the sum of its proper divisors (1).

611110081 is an equidigital number, since it uses as much as digits as its factorization.

611110081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 19.

The square root of 611110081 is about 24720.6407886203. The cubic root of 611110081 is about 848.6067514619.

Adding to 611110081 its reverse (180011116), we get a palindrome (791121197).

The spelling of 611110081 in words is "six hundred eleven million, one hundred ten thousand, eighty-one".