223709417509 has 2 divisors, whose sum is σ = 223709417510. Its totient is φ = 223709417508.

The previous prime is 223709417507. The next prime is 223709417539. The reversal of 223709417509 is 905714907322.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192504195009 + 31205222500 = 438753^2 + 176650^2 .

It is a cyclic number.

It is not a de Polignac number, because 223709417509 - 2¹ = 223709417507 is a prime.

Together with 223709417507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223709417507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111854708754 + 111854708755.

It is an arithmetic number, because the mean of its divisors is an integer number (111854708755).

Almost surely, 2^223709417509 is an apocalyptic number.

It is an amenable number.

223709417509 is a deficient number, since it is larger than the sum of its proper divisors (1).

223709417509 is an equidigital number, since it uses as much as digits as its factorization.

223709417509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 952560, while the sum is 49.

The spelling of 223709417509 in words is "two hundred twenty-three billion, seven hundred nine million, four hundred seventeen thousand, five hundred nine".