611299861 has 2 divisors, whose sum is σ = 611299862. Its totient is φ = 611299860.

The previous prime is 611299859. The next prime is 611299921. The reversal of 611299861 is 168992116.

611299861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 497557636 + 113742225 = 22306^2 + 10665^2 .

It is a cyclic number.

It is not a de Polignac number, because 611299861 - 2¹ = 611299859 is a prime.

Together with 611299859, it forms a pair of twin primes.

It is equal to p_31883596 and since 611299861 and 31883596 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611299831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305649930 + 305649931.

It is an arithmetic number, because the mean of its divisors is an integer number (305649931).

Almost surely, 2^611299861 is an apocalyptic number.

It is an amenable number.

611299861 is a deficient number, since it is larger than the sum of its proper divisors (1).

611299861 is an equidigital number, since it uses as much as digits as its factorization.

611299861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 43.

The square root of 611299861 is about 24724.4789833881. The cubic root of 611299861 is about 848.6945872032.

The spelling of 611299861 in words is "six hundred eleven million, two hundred ninety-nine thousand, eight hundred sixty-one".