1212320159 has 2 divisors, whose sum is σ = 1212320160. Its totient is φ = 1212320158.

The previous prime is 1212320129. The next prime is 1212320171. The reversal of 1212320159 is 9510232121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1212320159 - 2¹⁶ = 1212254623 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212320119) 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, 606160079 + 606160080.

It is an arithmetic number, because the mean of its divisors is an integer number (606160080).

Almost surely, 2^1212320159 is an apocalyptic number.

1212320159 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212320159 is an equidigital number, since it uses as much as digits as its factorization.

1212320159 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1212320159 is about 34818.3882309334. The cubic root of 1212320159 is about 1066.2828946338.

The spelling of 1212320159 in words is "one billion, two hundred twelve million, three hundred twenty thousand, one hundred fifty-nine".