1218963197 has 2 divisors, whose sum is σ = 1218963198. Its totient is φ = 1218963196.

The previous prime is 1218963181. The next prime is 1218963289. The reversal of 1218963197 is 7913698121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1218428836 + 534361 = 34906^2 + 731^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218963197 - 2⁴ = 1218963181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218963397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609481598 + 609481599.

It is an arithmetic number, because the mean of its divisors is an integer number (609481599).

Almost surely, 2^1218963197 is an apocalyptic number.

It is an amenable number.

1218963197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218963197 is an equidigital number, since it uses as much as digits as its factorization.

1218963197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 47.

The square root of 1218963197 is about 34913.6534467535. The cubic root of 1218963197 is about 1068.2269517853.

The spelling of 1218963197 in words is "one billion, two hundred eighteen million, nine hundred sixty-three thousand, one hundred ninety-seven".