261318223 has 2 divisors, whose sum is σ = 261318224. Its totient is φ = 261318222.

The previous prime is 261318103. The next prime is 261318259. The reversal of 261318223 is 322813162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261318223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261318191 and 261318200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261318283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130659111 + 130659112.

It is an arithmetic number, because the mean of its divisors is an integer number (130659112).

Almost surely, 2^261318223 is an apocalyptic number.

261318223 is a deficient number, since it is larger than the sum of its proper divisors (1).

261318223 is an equidigital number, since it uses as much as digits as its factorization.

261318223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 261318223 is about 16165.3401758206. The cubic root of 261318223 is about 639.3272740795.

The spelling of 261318223 in words is "two hundred sixty-one million, three hundred eighteen thousand, two hundred twenty-three".