218361232049 has 2 divisors, whose sum is σ = 218361232050. Its totient is φ = 218361232048.

The previous prime is 218361232031. The next prime is 218361232057. The reversal of 218361232049 is 940232163812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195600983824 + 22760248225 = 442268^2 + 150865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218361232049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 218361231997 and 218361232015.

It is not a weakly prime, because it can be changed into another prime (218361232009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109180616024 + 109180616025.

It is an arithmetic number, because the mean of its divisors is an integer number (109180616025).

Almost surely, 2^218361232049 is an apocalyptic number.

It is an amenable number.

218361232049 is a deficient number, since it is larger than the sum of its proper divisors (1).

218361232049 is an equidigital number, since it uses as much as digits as its factorization.

218361232049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 218361232049 in words is "two hundred eighteen billion, three hundred sixty-one million, two hundred thirty-two thousand, forty-nine".