209226842837 has 2 divisors, whose sum is σ = 209226842838. Its totient is φ = 209226842836.

The previous prime is 209226842801. The next prime is 209226842879. The reversal of 209226842837 is 738248622902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205599671761 + 3627171076 = 453431^2 + 60226^2 .

It is a cyclic number.

It is not a de Polignac number, because 209226842837 - 2²⁴ = 209210065621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209226842897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104613421418 + 104613421419.

It is an arithmetic number, because the mean of its divisors is an integer number (104613421419).

Almost surely, 2^209226842837 is an apocalyptic number.

It is an amenable number.

209226842837 is a deficient number, since it is larger than the sum of its proper divisors (1).

209226842837 is an equidigital number, since it uses as much as digits as its factorization.

209226842837 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4644864, while the sum is 53.

The spelling of 209226842837 in words is "two hundred nine billion, two hundred twenty-six million, eight hundred forty-two thousand, eight hundred thirty-seven".