261092265 has 16 divisors (see below), whose sum is σ = 477426048. Its totient is φ = 119356416.

The previous prime is 261092231. The next prime is 261092267. The reversal of 261092265 is 562290162.

It is not a de Polignac number, because 261092265 - 2⁶ = 261092201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261092267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1243192 + ... + 1243401.

It is an arithmetic number, because the mean of its divisors is an integer number (29839128).

Almost surely, 2^261092265 is an apocalyptic number.

It is an amenable number.

261092265 is a deficient number, since it is larger than the sum of its proper divisors (216333783).

261092265 is a wasteful number, since it uses less digits than its factorization.

261092265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2486608.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 261092265 is about 16158.3496991494. The cubic root of 261092265 is about 639.1429486642.

The spelling of 261092265 in words is "two hundred sixty-one million, ninety-two thousand, two hundred sixty-five".