261367265 has 24 divisors (see below), whose sum is σ = 335273472. Its totient is φ = 195557120.

The previous prime is 261367261. The next prime is 261367277. The reversal of 261367265 is 562763162.

261367265 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261367265 - 2² = 261367261 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261367261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 275522 + ... + 276468.

It is an arithmetic number, because the mean of its divisors is an integer number (13969728).

Almost surely, 2^261367265 is an apocalyptic number.

It is an amenable number.

261367265 is a deficient number, since it is larger than the sum of its proper divisors (73906207).

261367265 is a wasteful number, since it uses less digits than its factorization.

261367265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177 (or 1160 counting only the distinct ones).

The product of its digits is 90720, while the sum is 38.

The square root of 261367265 is about 16166.8569920068. The cubic root of 261367265 is about 639.3672660946.

The spelling of 261367265 in words is "two hundred sixty-one million, three hundred sixty-seven thousand, two hundred sixty-five".