261225206 has 24 divisors (see below), whose sum is σ = 431941440. Its totient is φ = 118396080.

The previous prime is 261225203. The next prime is 261225229. The reversal of 261225206 is 602522162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261225203) 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 11 ways as a sum of consecutive naturals, for example, 94715 + ... + 97433.

It is an arithmetic number, because the mean of its divisors is an integer number (17997560).

Almost surely, 2^261225206 is an apocalyptic number.

261225206 is a deficient number, since it is larger than the sum of its proper divisors (170716234).

261225206 is a wasteful number, since it uses less digits than its factorization.

261225206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3140 (or 3129 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 261225206 is about 16162.4628692536. The cubic root of 261225206 is about 639.2514082613.

Adding to 261225206 its reverse (602522162), we get a palindrome (863747368).

The spelling of 261225206 in words is "two hundred sixty-one million, two hundred twenty-five thousand, two hundred six".