1218161039 has 2 divisors, whose sum is σ = 1218161040. Its totient is φ = 1218161038.

The previous prime is 1218161011. The next prime is 1218161069. The reversal of 1218161039 is 9301618121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1218161039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1218160996 and 1218161014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218161069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609080519 + 609080520.

It is an arithmetic number, because the mean of its divisors is an integer number (609080520).

Almost surely, 2^1218161039 is an apocalyptic number.

1218161039 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218161039 is an equidigital number, since it uses as much as digits as its factorization.

1218161039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 1218161039 is about 34902.1638154427. The cubic root of 1218161039 is about 1067.9925791565.

The spelling of 1218161039 in words is "one billion, two hundred eighteen million, one hundred sixty-one thousand, thirty-nine".