261335523 has 8 divisors (see below), whose sum is σ = 348601536. Its totient is φ = 174146600.

The previous prime is 261335513. The next prime is 261335531. The reversal of 261335523 is 325533162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261335523 - 2⁴ = 261335507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261335513) 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 in 7 ways as a sum of consecutive naturals, for example, 10833 + ... + 25298.

It is an arithmetic number, because the mean of its divisors is an integer number (43575192).

Almost surely, 2^261335523 is an apocalyptic number.

261335523 is a deficient number, since it is larger than the sum of its proper divisors (87266013).

261335523 is a wasteful number, since it uses less digits than its factorization.

261335523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38545.

The product of its digits is 16200, while the sum is 30.

The square root of 261335523 is about 16165.8752624162. The cubic root of 261335523 is about 639.3413821883.

Adding to 261335523 its reverse (325533162), we get a palindrome (586868685).

The spelling of 261335523 in words is "two hundred sixty-one million, three hundred thirty-five thousand, five hundred twenty-three".