218040049 has 2 divisors, whose sum is σ = 218040050. Its totient is φ = 218040048.

The previous prime is 218039993. The next prime is 218040059. The reversal of 218040049 is 940040812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215502400 + 2537649 = 14680^2 + 1593^2 .

It is a cyclic number.

It is not a de Polignac number, because 218040049 - 2⁹ = 218039537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 218039999 and 218040026.

It is not a weakly prime, because it can be changed into another prime (218040059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109020024 + 109020025.

It is an arithmetic number, because the mean of its divisors is an integer number (109020025).

Almost surely, 2^218040049 is an apocalyptic number.

It is an amenable number.

218040049 is a deficient number, since it is larger than the sum of its proper divisors (1).

218040049 is an equidigital number, since it uses as much as digits as its factorization.

218040049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 218040049 is about 14766.1792282229. The cubic root of 218040049 is about 601.8830184794.

The spelling of 218040049 in words is "two hundred eighteen million, forty thousand, forty-nine".