218055377 has 2 divisors, whose sum is σ = 218055378. Its totient is φ = 218055376.

The previous prime is 218055373. The next prime is 218055491. The reversal of 218055377 is 773550812.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206468161 + 11587216 = 14369^2 + 3404^2 .

It is a cyclic number.

It is not a de Polignac number, because 218055377 - 2² = 218055373 is a prime.

It is a super-2 number, since 2×218055377² = 95096294877224258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 218055377.

It is not a weakly prime, because it can be changed into another prime (218055371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109027688 + 109027689.

It is an arithmetic number, because the mean of its divisors is an integer number (109027689).

Almost surely, 2^218055377 is an apocalyptic number.

It is an amenable number.

218055377 is a deficient number, since it is larger than the sum of its proper divisors (1).

218055377 is an equidigital number, since it uses as much as digits as its factorization.

218055377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58800, while the sum is 38.

The square root of 218055377 is about 14766.6982430061. The cubic root of 218055377 is about 601.8971220761.

The spelling of 218055377 in words is "two hundred eighteen million, fifty-five thousand, three hundred seventy-seven".