209306075097 has 24 divisors (see below), whose sum is σ = 326581972416. Its totient is φ = 118887269088.

The previous prime is 209306075093. The next prime is 209306075129. The reversal of 209306075097 is 790570603902.

It is not a de Polignac number, because 209306075097 - 2² = 209306075093 is a prime.

It is a super-2 number, since 2×209306075097² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (209306075093) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4238478 + ... + 4287575.

It is an arithmetic number, because the mean of its divisors is an integer number (13607582184).

Almost surely, 2^209306075097 is an apocalyptic number.

It is an amenable number.

209306075097 is a deficient number, since it is larger than the sum of its proper divisors (117275897319).

209306075097 is a wasteful number, since it uses less digits than its factorization.

209306075097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8526237 (or 8526230 counting only the distinct ones).

The product of its (nonzero) digits is 714420, while the sum is 48.

Adding to 209306075097 its reverse (790570603902), we get a palindrome (999876678999).

The spelling of 209306075097 in words is "two hundred nine billion, three hundred six million, seventy-five thousand, ninety-seven".