261353201 has 4 divisors (see below), whose sum is σ = 265034304. Its totient is φ = 257672100.

The previous prime is 261353167. The next prime is 261353203. The reversal of 261353201 is 102353162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261353201 - 2¹⁰ = 261352177 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 (261353203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1840445 + ... + 1840586.

It is an arithmetic number, because the mean of its divisors is an integer number (66258576).

Almost surely, 2^261353201 is an apocalyptic number.

It is an amenable number.

261353201 is a deficient number, since it is larger than the sum of its proper divisors (3681103).

261353201 is an equidigital number, since it uses as much as digits as its factorization.

261353201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3681102.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 261353201 is about 16166.4220222039. The cubic root of 261353201 is about 639.3557979121.

The spelling of 261353201 in words is "two hundred sixty-one million, three hundred fifty-three thousand, two hundred one".