265535243 has 16 divisors (see below), whose sum is σ = 279724032. Its totient is φ = 251748000.

The previous prime is 265535239. The next prime is 265535251. The reversal of 265535243 is 342535562.

It is a cyclic number.

It is not a de Polignac number, because 265535243 - 2² = 265535239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (265535213) 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, 490553 + ... + 491093.

It is an arithmetic number, because the mean of its divisors is an integer number (17482752).

Almost surely, 2^265535243 is an apocalyptic number.

265535243 is a deficient number, since it is larger than the sum of its proper divisors (14188789).

265535243 is a wasteful number, since it uses less digits than its factorization.

265535243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866.

The product of its digits is 108000, while the sum is 35.

The square root of 265535243 is about 16295.2521612892. The cubic root of 265535243 is about 642.7479846381.

The spelling of 265535243 in words is "two hundred sixty-five million, five hundred thirty-five thousand, two hundred forty-three".