261206225 has 12 divisors (see below), whose sum is σ = 370166784. Its totient is φ = 179112720.

The previous prime is 261206221. The next prime is 261206227. The reversal of 261206225 is 522602162.

261206225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261206225 - 2² = 261206221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261206194 and 261206203.

It is not an unprimeable number, because it can be changed into a prime (261206221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 746129 + ... + 746478.

It is an arithmetic number, because the mean of its divisors is an integer number (30847232).

Almost surely, 2^261206225 is an apocalyptic number.

261206225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261206225 is a deficient number, since it is larger than the sum of its proper divisors (108960559).

261206225 is a wasteful number, since it uses less digits than its factorization.

261206225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492624 (or 1492619 counting only the distinct ones).

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

The square root of 261206225 is about 16161.8756646622. The cubic root of 261206225 is about 639.2359249100.

Adding to 261206225 its reverse (522602162), we get a palindrome (783808387).

The spelling of 261206225 in words is "two hundred sixty-one million, two hundred six thousand, two hundred twenty-five".