261252543 has 16 divisors (see below), whose sum is σ = 353283840. Its totient is φ = 171704064.

The previous prime is 261252521. The next prime is 261252581. The reversal of 261252543 is 345252162.

It is not a de Polignac number, because 261252543 - 2⁶ = 261252479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261252543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261252143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166798 + ... + 168356.

It is an arithmetic number, because the mean of its divisors is an integer number (22080240).

Almost surely, 2^261252543 is an apocalyptic number.

261252543 is a deficient number, since it is larger than the sum of its proper divisors (92031297).

261252543 is a wasteful number, since it uses less digits than its factorization.

261252543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2318.

The product of its digits is 14400, while the sum is 30.

The square root of 261252543 is about 16163.3085412610. The cubic root of 261252543 is about 639.2737065258.

It can be divided in two parts, 2612 and 52543, that added together give a palindrome (55155).

The spelling of 261252543 in words is "two hundred sixty-one million, two hundred fifty-two thousand, five hundred forty-three".