218412231539 has 2 divisors, whose sum is σ = 218412231540. Its totient is φ = 218412231538.

The previous prime is 218412231473. The next prime is 218412231683. The reversal of 218412231539 is 935132214812.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218412231539 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 218412231496 and 218412231505.

It is not a weakly prime, because it can be changed into another prime (218412231439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109206115769 + 109206115770.

It is an arithmetic number, because the mean of its divisors is an integer number (109206115770).

Almost surely, 2^218412231539 is an apocalyptic number.

218412231539 is a deficient number, since it is larger than the sum of its proper divisors (1).

218412231539 is an equidigital number, since it uses as much as digits as its factorization.

218412231539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 41.

The spelling of 218412231539 in words is "two hundred eighteen billion, four hundred twelve million, two hundred thirty-one thousand, five hundred thirty-nine".