219138377 has 2 divisors, whose sum is σ = 219138378. Its totient is φ = 219138376.

The previous prime is 219138289. The next prime is 219138379. The reversal of 219138377 is 773831912.

219138377 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., 218330176 + 808201 = 14776^2 + 899^2 .

It is a cyclic number.

It is not a de Polignac number, because 219138377 - 2⁸ = 219138121 is a prime.

Together with 219138379, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (219138379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109569188 + 109569189.

It is an arithmetic number, because the mean of its divisors is an integer number (109569189).

Almost surely, 2^219138377 is an apocalyptic number.

It is an amenable number.

219138377 is a deficient number, since it is larger than the sum of its proper divisors (1).

219138377 is an equidigital number, since it uses as much as digits as its factorization.

219138377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 41.

The square root of 219138377 is about 14803.3231742065. The cubic root of 219138377 is about 602.8919433411.

The spelling of 219138377 in words is "two hundred nineteen million, one hundred thirty-eight thousand, three hundred seventy-seven".