261225245 has 8 divisors (see below), whose sum is σ = 313740216. Its totient is φ = 208800256.

The previous prime is 261225233. The next prime is 261225269. The reversal of 261225245 is 542522162.

It can be written as a sum of positive squares in 4 ways, for example, as 86007076 + 175218169 = 9274^2 + 13237^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261225245 - 2⁴ = 261225229 is a prime.

It is a super-3 number, since 3×261225245³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15932 + ... + 27861.

It is an arithmetic number, because the mean of its divisors is an integer number (39217527).

Almost surely, 2^261225245 is an apocalyptic number.

It is an amenable number.

261225245 is a deficient number, since it is larger than the sum of its proper divisors (52514971).

261225245 is a wasteful number, since it uses less digits than its factorization.

261225245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44991.

The product of its digits is 9600, while the sum is 29.

The square root of 261225245 is about 16162.4640757528. The cubic root of 261225245 is about 639.2514400740.

The spelling of 261225245 in words is "two hundred sixty-one million, two hundred twenty-five thousand, two hundred forty-five".