158945209 has 2 divisors, whose sum is σ = 158945210. Its totient is φ = 158945208.

The previous prime is 158945197. The next prime is 158945221. The reversal of 158945209 is 902549851.

It is a balanced prime because it is at equal distance from previous prime (158945197) and next prime (158945221).

It can be written as a sum of positive squares in only one way, i.e., 91623184 + 67322025 = 9572^2 + 8205^2 .

It is a cyclic number.

It is not a de Polignac number, because 158945209 - 2¹³ = 158937017 is a prime.

It is not a weakly prime, because it can be changed into another prime (158940209) 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, 79472604 + 79472605.

It is an arithmetic number, because the mean of its divisors is an integer number (79472605).

Almost surely, 2^158945209 is an apocalyptic number.

It is an amenable number.

158945209 is a deficient number, since it is larger than the sum of its proper divisors (1).

158945209 is an equidigital number, since it uses as much as digits as its factorization.

158945209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 43.

The square root of 158945209 is about 12607.3474212461. The cubic root of 158945209 is about 541.6879157686.

The spelling of 158945209 in words is "one hundred fifty-eight million, nine hundred forty-five thousand, two hundred nine".