261873225 has 36 divisors (see below), whose sum is σ = 479969776. Its totient is φ = 136412640.

The previous prime is 261873221. The next prime is 261873233. The reversal of 261873225 is 522378162.

261873225 is a `hidden beast` number, since 2 + 618 + 7 + 32 + 2 + 5 = 666.

It is not a de Polignac number, because 261873225 - 2² = 261873221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261873225.

It is not an unprimeable number, because it can be changed into a prime (261873221) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3859 + ... + 23208.

Almost surely, 2^261873225 is an apocalyptic number.

261873225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261873225 is a deficient number, since it is larger than the sum of its proper divisors (218096551).

261873225 is a wasteful number, since it uses less digits than its factorization.

261873225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27126 (or 27118 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 261873225 is about 16182.4974895719. The cubic root of 261873225 is about 639.7795668265.

The spelling of 261873225 in words is "two hundred sixty-one million, eight hundred seventy-three thousand, two hundred twenty-five".