219461861 has 2 divisors, whose sum is σ = 219461862. Its totient is φ = 219461860.

The previous prime is 219461839. The next prime is 219461863. The reversal of 219461861 is 168164912.

219461861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212984836 + 6477025 = 14594^2 + 2545^2 .

It is a cyclic number.

It is not a de Polignac number, because 219461861 - 2⁶ = 219461797 is a prime.

Together with 219461863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219461863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109730930 + 109730931.

It is an arithmetic number, because the mean of its divisors is an integer number (109730931).

Almost surely, 2^219461861 is an apocalyptic number.

It is an amenable number.

219461861 is a deficient number, since it is larger than the sum of its proper divisors (1).

219461861 is an equidigital number, since it uses as much as digits as its factorization.

219461861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 219461861 is about 14814.2452052070. The cubic root of 219461861 is about 603.1884531162.

The spelling of 219461861 in words is "two hundred nineteen million, four hundred sixty-one thousand, eight hundred sixty-one".