209215223573 has 2 divisors, whose sum is σ = 209215223574. Its totient is φ = 209215223572.

The previous prime is 209215223461. The next prime is 209215223579. The reversal of 209215223573 is 375322512902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201886665124 + 7328558449 = 449318^2 + 85607^2 .

It is a cyclic number.

It is not a de Polignac number, because 209215223573 - 2³⁶ = 140495746837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209215223573.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209215223579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104607611786 + 104607611787.

It is an arithmetic number, because the mean of its divisors is an integer number (104607611787).

Almost surely, 2^209215223573 is an apocalyptic number.

It is an amenable number.

209215223573 is a deficient number, since it is larger than the sum of its proper divisors (1).

209215223573 is an equidigital number, since it uses as much as digits as its factorization.

209215223573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 41.

The spelling of 209215223573 in words is "two hundred nine billion, two hundred fifteen million, two hundred twenty-three thousand, five hundred seventy-three".