261206003 has 6 divisors (see below), whose sum is σ = 277475196. Its totient is φ = 245840672.

The previous prime is 261205933. The next prime is 261206017. The reversal of 261206003 is 300602162.

It is not a de Polignac number, because 261206003 - 2¹⁴ = 261189619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261206303) 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 5 ways as a sum of consecutive naturals, for example, 451625 + ... + 452202.

It is an arithmetic number, because the mean of its divisors is an integer number (46245866).

Almost surely, 2^261206003 is an apocalyptic number.

261206003 is a deficient number, since it is larger than the sum of its proper divisors (16269193).

261206003 is an equidigital number, since it uses as much as digits as its factorization.

261206003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903861 (or 903844 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 261206003 is about 16161.8687966460. The cubic root of 261206003 is about 639.2357438138.

Adding to 261206003 its reverse (300602162), we get a palindrome (561808165).

It can be divided in two parts, 26120 and 6003, that added together give a palindrome (32123).

The spelling of 261206003 in words is "two hundred sixty-one million, two hundred six thousand, three".