261336353 has 4 divisors (see below), whose sum is σ = 261635220. Its totient is φ = 261037488.

The previous prime is 261336349. The next prime is 261336377. The reversal of 261336353 is 353633162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 234947584 + 26388769 = 15328^2 + 5137^2 .

It is a cyclic number.

It is not a de Polignac number, because 261336353 - 2² = 261336349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261336253) 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, 148118 + ... + 149871.

It is an arithmetic number, because the mean of its divisors is an integer number (65408805).

Almost surely, 2^261336353 is an apocalyptic number.

It is an amenable number.

261336353 is a deficient number, since it is larger than the sum of its proper divisors (298867).

261336353 is an equidigital number, since it uses as much as digits as its factorization.

261336353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298866.

The product of its digits is 29160, while the sum is 32.

The square root of 261336353 is about 16165.9009337556. The cubic root of 261336353 is about 639.3420590357.

The spelling of 261336353 in words is "two hundred sixty-one million, three hundred thirty-six thousand, three hundred fifty-three".