209861435383 has 2 divisors, whose sum is σ = 209861435384. Its totient is φ = 209861435382.

The previous prime is 209861435363. The next prime is 209861435401. The reversal of 209861435383 is 383534168902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209861435383 is a prime.

It is a super-2 number, since 2×209861435383² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 209861435383.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209861435353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104930717691 + 104930717692.

It is an arithmetic number, because the mean of its divisors is an integer number (104930717692).

Almost surely, 2^209861435383 is an apocalyptic number.

209861435383 is a deficient number, since it is larger than the sum of its proper divisors (1).

209861435383 is an equidigital number, since it uses as much as digits as its factorization.

209861435383 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3732480, while the sum is 52.

The spelling of 209861435383 in words is "two hundred nine billion, eight hundred sixty-one million, four hundred thirty-five thousand, three hundred eighty-three".