261353611 has 4 divisors (see below), whose sum is σ = 261388912. Its totient is φ = 261318312.

The previous prime is 261353593. The next prime is 261353641. The reversal of 261353611 is 116353162.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 261353611 - 2¹⁷ = 261222539 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 261353611.

It is not an unprimeable number, because it can be changed into a prime (261353641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1800 + ... + 22933.

It is an arithmetic number, because the mean of its divisors is an integer number (65347228).

Almost surely, 2^261353611 is an apocalyptic number.

261353611 is a deficient number, since it is larger than the sum of its proper divisors (35301).

261353611 is a wasteful number, since it uses less digits than its factorization.

261353611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35300.

The product of its digits is 3240, while the sum is 28.

The square root of 261353611 is about 16166.4347028032. The cubic root of 261353611 is about 639.3561322435.

The spelling of 261353611 in words is "two hundred sixty-one million, three hundred fifty-three thousand, six hundred eleven".