209396823547 has 2 divisors, whose sum is σ = 209396823548. Its totient is φ = 209396823546.

The previous prime is 209396823529. The next prime is 209396823563. The reversal of 209396823547 is 745328693902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209396823547 is a prime.

It is a super-2 number, since 2×209396823547² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 209396823491 and 209396823500.

It is not a weakly prime, because it can be changed into another prime (209390823547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104698411773 + 104698411774.

It is an arithmetic number, because the mean of its divisors is an integer number (104698411774).

Almost surely, 2^209396823547 is an apocalyptic number.

209396823547 is a deficient number, since it is larger than the sum of its proper divisors (1).

209396823547 is an equidigital number, since it uses as much as digits as its factorization.

209396823547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19595520, while the sum is 58.

It can be divided in two parts, 20939 and 6823547, that added together give a palindrome (6844486).

The spelling of 209396823547 in words is "two hundred nine billion, three hundred ninety-six million, eight hundred twenty-three thousand, five hundred forty-seven".