261523265 has 8 divisors (see below), whose sum is σ = 314658240. Its totient is φ = 208665072.

The previous prime is 261523261. The next prime is 261523279. The reversal of 261523265 is 562325162.

261523265 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 261523265 - 2² = 261523261 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261523261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67109 + ... + 70898.

It is an arithmetic number, because the mean of its divisors is an integer number (39332280).

Almost surely, 2^261523265 is an apocalyptic number.

It is an amenable number.

261523265 is a deficient number, since it is larger than the sum of its proper divisors (53134975).

261523265 is a wasteful number, since it uses less digits than its factorization.

261523265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138391.

The product of its digits is 21600, while the sum is 32.

The square root of 261523265 is about 16171.6809577731. The cubic root of 261523265 is about 639.4944453166.

The spelling of 261523265 in words is "two hundred sixty-one million, five hundred twenty-three thousand, two hundred sixty-five".