261626225 has 24 divisors (see below), whose sum is σ = 371547648. Its totient is φ = 179020800.

The previous prime is 261626203. The next prime is 261626227. The reversal of 261626225 is 522626162.

261626225 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 261626225 - 2⁶ = 261626161 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261626191 and 261626200.

It is not an unprimeable number, because it can be changed into a prime (261626227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99680 + ... + 102270.

It is an arithmetic number, because the mean of its divisors is an integer number (15481152).

Almost surely, 2^261626225 is an apocalyptic number.

261626225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261626225 is a deficient number, since it is larger than the sum of its proper divisors (109921423).

261626225 is a wasteful number, since it uses less digits than its factorization.

261626225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3185 (or 3180 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 261626225 is about 16174.8639870634. The cubic root of 261626225 is about 639.5783559002.

The spelling of 261626225 in words is "two hundred sixty-one million, six hundred twenty-six thousand, two hundred twenty-five".