1215722159 has 2 divisors, whose sum is σ = 1215722160. Its totient is φ = 1215722158.

The previous prime is 1215722143. The next prime is 1215722161. The reversal of 1215722159 is 9512275121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1215722159 - 2⁴ = 1215722143 is a prime.

Together with 1215722161, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215721159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607861079 + 607861080.

It is an arithmetic number, because the mean of its divisors is an integer number (607861080).

Almost surely, 2^1215722159 is an apocalyptic number.

1215722159 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215722159 is an equidigital number, since it uses as much as digits as its factorization.

1215722159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12600, while the sum is 35.

The square root of 1215722159 is about 34867.2075021789. The cubic root of 1215722159 is about 1067.2793603818.

The spelling of 1215722159 in words is "one billion, two hundred fifteen million, seven hundred twenty-two thousand, one hundred fifty-nine".