219678061 has 2 divisors, whose sum is σ = 219678062. Its totient is φ = 219678060.

The previous prime is 219678031. The next prime is 219678073. The reversal of 219678061 is 160876912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207532836 + 12145225 = 14406^2 + 3485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-219678061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219678031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109839030 + 109839031.

It is an arithmetic number, because the mean of its divisors is an integer number (109839031).

Almost surely, 2^219678061 is an apocalyptic number.

It is an amenable number.

219678061 is a deficient number, since it is larger than the sum of its proper divisors (1).

219678061 is an equidigital number, since it uses as much as digits as its factorization.

219678061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 219678061 is about 14821.5404395090. The cubic root of 219678061 is about 603.3864625300.

The spelling of 219678061 in words is "two hundred nineteen million, six hundred seventy-eight thousand, sixty-one".