261043135 has 8 divisors (see below), whose sum is σ = 313553376. Its totient is φ = 208633440.

The previous prime is 261043127. The next prime is 261043151. The reversal of 261043135 is 531340162.

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

It is not a de Polignac number, because 261043135 - 2³ = 261043127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19299 + ... + 29908.

It is an arithmetic number, because the mean of its divisors is an integer number (39194172).

Almost surely, 2^261043135 is an apocalyptic number.

261043135 is a deficient number, since it is larger than the sum of its proper divisors (52510241).

261043135 is a wasteful number, since it uses less digits than its factorization.

261043135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50273.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 261043135 is about 16156.8293609854. The cubic root of 261043135 is about 639.1028567540.

Adding to 261043135 its reverse (531340162), we get a palindrome (792383297).

The spelling of 261043135 in words is "two hundred sixty-one million, forty-three thousand, one hundred thirty-five".