261501223 has 2 divisors, whose sum is σ = 261501224. Its totient is φ = 261501222.

The previous prime is 261501217. The next prime is 261501269. The reversal of 261501223 is 322105162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261501223 - 2⁹ = 261500711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261501194 and 261501203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261501623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130750611 + 130750612.

It is an arithmetic number, because the mean of its divisors is an integer number (130750612).

Almost surely, 2^261501223 is an apocalyptic number.

261501223 is a deficient number, since it is larger than the sum of its proper divisors (1).

261501223 is an equidigital number, since it uses as much as digits as its factorization.

261501223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 261501223 is about 16170.9994434481. Note that the first 3 decimals coincide. The cubic root of 261501223 is about 639.4764786134.

Adding to 261501223 its reverse (322105162), we get a palindrome (583606385).

The spelling of 261501223 in words is "two hundred sixty-one million, five hundred one thousand, two hundred twenty-three".