261873563 has 8 divisors (see below), whose sum is σ = 299382528. Its totient is φ = 224389224.

The previous prime is 261873551. The next prime is 261873581. The reversal of 261873563 is 365378162.

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

It is a cyclic number.

It is not a de Polignac number, because 261873563 - 2²⁰ = 260824987 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 261873563.

It is not an unprimeable number, because it can be changed into a prime (261873503) 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, 34970 + ... + 41792.

It is an arithmetic number, because the mean of its divisors is an integer number (37422816).

Almost surely, 2^261873563 is an apocalyptic number.

261873563 is a deficient number, since it is larger than the sum of its proper divisors (37508965).

261873563 is an equidigital number, since it uses as much as digits as its factorization.

261873563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12313.

The product of its digits is 181440, while the sum is 41.

The square root of 261873563 is about 16182.5079329503. The cubic root of 261873563 is about 639.7798420811.

The spelling of 261873563 in words is "two hundred sixty-one million, eight hundred seventy-three thousand, five hundred sixty-three".