209026379197 has 2 divisors, whose sum is σ = 209026379198. Its totient is φ = 209026379196.

The previous prime is 209026379179. The next prime is 209026379203. The reversal of 209026379197 is 791973620902.

Together with previous prime (209026379179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108622317241 + 100404061956 = 329579^2 + 316866^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209026379197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209026379147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104513189598 + 104513189599.

It is an arithmetic number, because the mean of its divisors is an integer number (104513189599).

Almost surely, 2^209026379197 is an apocalyptic number.

It is an amenable number.

209026379197 is a deficient number, since it is larger than the sum of its proper divisors (1).

209026379197 is an equidigital number, since it uses as much as digits as its factorization.

209026379197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2571912, while the sum is 55.

The spelling of 209026379197 in words is "two hundred nine billion, twenty-six million, three hundred seventy-nine thousand, one hundred ninety-seven".