209142297 has 32 divisors (see below), whose sum is σ = 381346560. Its totient is φ = 110315520.

The previous prime is 209142281. The next prime is 209142301. The reversal of 209142297 is 792241902.

It is not a de Polignac number, because 209142297 - 2⁴ = 209142281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (209142247) 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 in 31 ways as a sum of consecutive naturals, for example, 40104 + ... + 45017.

It is an arithmetic number, because the mean of its divisors is an integer number (11917080).

Almost surely, 2^209142297 is an apocalyptic number.

209142297 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

209142297 is a deficient number, since it is larger than the sum of its proper divisors (172204263).

209142297 is a wasteful number, since it uses less digits than its factorization.

209142297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85150 (or 85144 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 209142297 is about 14461.7529020517. The cubic root of 209142297 is about 593.5818657156.

The spelling of 209142297 in words is "two hundred nine million, one hundred forty-two thousand, two hundred ninety-seven".