611121061 has 2 divisors, whose sum is σ = 611121062. Its totient is φ = 611121060.

The previous prime is 611121059. The next prime is 611121101. The reversal of 611121061 is 160121116.

611121061 = T₂₀₁₈₃ + T₂₀₁₈₄ + T₂₀₁₈₅.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 594872100 + 16248961 = 24390^2 + 4031^2 .

It is a cyclic number.

It is not a de Polignac number, because 611121061 - 2¹ = 611121059 is a prime.

Together with 611121059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611121041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305560530 + 305560531.

It is an arithmetic number, because the mean of its divisors is an integer number (305560531).

Almost surely, 2^611121061 is an apocalyptic number.

611121061 is the 20185-th centered triangular number.

It is an amenable number.

611121061 is a deficient number, since it is larger than the sum of its proper divisors (1).

611121061 is an equidigital number, since it uses as much as digits as its factorization.

611121061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 611121061 is about 24720.8628692447. The cubic root of 611121061 is about 848.6118338230.

Adding to 611121061 its reverse (160121116), we get a palindrome (771242177).

It can be divided in two parts, 6111 and 21061, that added together give a palindrome (27172).

The spelling of 611121061 in words is "six hundred eleven million, one hundred twenty-one thousand, sixty-one".