611326861 has 2 divisors, whose sum is σ = 611326862. Its totient is φ = 611326860.

The previous prime is 611326831. The next prime is 611326871. The reversal of 611326861 is 168623116.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 395413225 + 215913636 = 19885^2 + 14694^2 .

It is a cyclic number.

It is not a de Polignac number, because 611326861 - 2¹⁵ = 611294093 is a prime.

It is a super-2 number, since 2×611326861² = 747441061960226642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611326801) 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, 305663430 + 305663431.

It is an arithmetic number, because the mean of its divisors is an integer number (305663431).

Almost surely, 2^611326861 is an apocalyptic number.

It is an amenable number.

611326861 is a deficient number, since it is larger than the sum of its proper divisors (1).

611326861 is an equidigital number, since it uses as much as digits as its factorization.

611326861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 34.

The square root of 611326861 is about 24725.0249949318. The cubic root of 611326861 is about 848.7070821166.

Adding to 611326861 its reverse (168623116), we get a palindrome (779949977).

The spelling of 611326861 in words is "six hundred eleven million, three hundred twenty-six thousand, eight hundred sixty-one".