1215864193 has 2 divisors, whose sum is σ = 1215864194. Its totient is φ = 1215864192.

The previous prime is 1215864109. The next prime is 1215864211. The reversal of 1215864193 is 3914685121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1214383104 + 1481089 = 34848^2 + 1217^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215864193 is a prime.

It is not a weakly prime, because it can be changed into another prime (1215864493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607932096 + 607932097.

It is an arithmetic number, because the mean of its divisors is an integer number (607932097).

Almost surely, 2^1215864193 is an apocalyptic number.

It is an amenable number.

1215864193 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215864193 is an equidigital number, since it uses as much as digits as its factorization.

1215864193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 40.

The square root of 1215864193 is about 34869.2442275424. The cubic root of 1215864193 is about 1067.3209225245.

The spelling of 1215864193 in words is "one billion, two hundred fifteen million, eight hundred sixty-four thousand, one hundred ninety-three".