261611203 has 16 divisors (see below), whose sum is σ = 301855680. Its totient is φ = 222097536.

The previous prime is 261611191. The next prime is 261611243. The reversal of 261611203 is 302116162.

It is a cyclic number.

It is not a de Polignac number, because 261611203 - 2⁹ = 261610691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261611243) 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 15 ways as a sum of consecutive naturals, for example, 469401 + ... + 469957.

It is an arithmetic number, because the mean of its divisors is an integer number (18865980).

Almost surely, 2^261611203 is an apocalyptic number.

261611203 is a deficient number, since it is larger than the sum of its proper divisors (40244477).

261611203 is a wasteful number, since it uses less digits than its factorization.

261611203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 261611203 is about 16174.3996179147. The cubic root of 261611203 is about 639.5661146070.

Adding to 261611203 its reverse (302116162), we get a palindrome (563727365).

The spelling of 261611203 in words is "two hundred sixty-one million, six hundred eleven thousand, two hundred three".