261443361 has 8 divisors (see below), whose sum is σ = 350730400. Its totient is φ = 173225952.

The previous prime is 261443359. The next prime is 261443383. The reversal of 261443361 is 163344162.

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

It is not a de Polignac number, because 261443361 - 2¹ = 261443359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261443341) 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, 266836 + ... + 267813.

It is an arithmetic number, because the mean of its divisors is an integer number (43841300).

Almost surely, 2^261443361 is an apocalyptic number.

It is an amenable number.

261443361 is a deficient number, since it is larger than the sum of its proper divisors (89287039).

261443361 is a wasteful number, since it uses less digits than its factorization.

261443361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534815.

The product of its digits is 10368, while the sum is 30.

The square root of 261443361 is about 16169.2102775615. The cubic root of 261443361 is about 639.4293097870.

The spelling of 261443361 in words is "two hundred sixty-one million, four hundred forty-three thousand, three hundred sixty-one".