209023197945427 has 2 divisors, whose sum is σ = 209023197945428. Its totient is φ = 209023197945426.

The previous prime is 209023197945361. The next prime is 209023197945559. The reversal of 209023197945427 is 724549791320902.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209023197945427 is a prime.

It is a super-3 number, since 3×209023197945427³ (a number of 44 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (209023197945827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104511598972713 + 104511598972714.

It is an arithmetic number, because the mean of its divisors is an integer number (104511598972714).

Almost surely, 2^{209023197945427} is an apocalyptic number.

209023197945427 is a deficient number, since it is larger than the sum of its proper divisors (1).

209023197945427 is an equidigital number, since it uses as much as digits as its factorization.

209023197945427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68584320, while the sum is 64.

The spelling of 209023197945427 in words is "two hundred nine trillion, twenty-three billion, one hundred ninety-seven million, nine hundred forty-five thousand, four hundred twenty-seven".