261330235 has 4 divisors (see below), whose sum is σ = 313596288. Its totient is φ = 209064184.

The previous prime is 261330203. The next prime is 261330247. The reversal of 261330235 is 532033162.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261330235 - 2⁵ = 261330203 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 26133019 + ... + 26133028.

It is an arithmetic number, because the mean of its divisors is an integer number (78399072).

Almost surely, 2^261330235 is an apocalyptic number.

261330235 is a deficient number, since it is larger than the sum of its proper divisors (52266053).

261330235 is an equidigital number, since it uses as much as digits as its factorization.

261330235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52266052.

The product of its (nonzero) digits is 3240, while the sum is 25.

The square root of 261330235 is about 16165.7117071906. The cubic root of 261330235 is about 639.3370699030.

Adding to 261330235 its reverse (532033162), we get a palindrome (793363397).

The spelling of 261330235 in words is "two hundred sixty-one million, three hundred thirty thousand, two hundred thirty-five".