261135543 has 8 divisors (see below), whose sum is σ = 351770608. Its totient is φ = 172295424.

The previous prime is 261135541. The next prime is 261135557. The reversal of 261135543 is 345531162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261135543 - 2¹ = 261135541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261135543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261135541) 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, 448396 + ... + 448977.

It is an arithmetic number, because the mean of its divisors is an integer number (43971326).

Almost surely, 2^261135543 is an apocalyptic number.

261135543 is a deficient number, since it is larger than the sum of its proper divisors (90635065).

261135543 is an equidigital number, since it uses as much as digits as its factorization.

261135543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897473.

The product of its digits is 10800, while the sum is 30.

The square root of 261135543 is about 16159.6888274496. The cubic root of 261135543 is about 639.1782609580.

The spelling of 261135543 in words is "two hundred sixty-one million, one hundred thirty-five thousand, five hundred forty-three".