261263743 has 16 divisors (see below), whose sum is σ = 289529856. Its totient is φ = 234228960.

The previous prime is 261263731. The next prime is 261263791. The reversal of 261263743 is 347362162.

It is a cyclic number.

It is not a de Polignac number, because 261263743 - 2⁹ = 261263231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261263699 and 261263708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261273743) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 105546 + ... + 107992.

It is an arithmetic number, because the mean of its divisors is an integer number (18095616).

Almost surely, 2^261263743 is an apocalyptic number.

261263743 is a deficient number, since it is larger than the sum of its proper divisors (28266113).

261263743 is a wasteful number, since it uses less digits than its factorization.

261263743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2694.

The product of its digits is 36288, while the sum is 34.

The square root of 261263743 is about 16163.6550012675. The cubic root of 261263743 is about 639.2828417009.

The spelling of 261263743 in words is "two hundred sixty-one million, two hundred sixty-three thousand, seven hundred forty-three".