261106245 has 48 divisors (see below), whose sum is σ = 467458992. Its totient is φ = 134737920.

The previous prime is 261106231. The next prime is 261106283. The reversal of 261106245 is 542601162.

261106245 is a `hidden beast` number, since 2 + 611 + 0 + 6 + 2 + 45 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 25281 + 261080964 = 159^2 + 16158^2 .

It is not a de Polignac number, because 261106245 - 2⁷ = 261106117 is a prime.

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 47 ways as a sum of consecutive naturals, for example, 252249 + ... + 253281.

It is an arithmetic number, because the mean of its divisors is an integer number (9738729).

Almost surely, 2^261106245 is an apocalyptic number.

It is an amenable number.

261106245 is a deficient number, since it is larger than the sum of its proper divisors (206352747).

261106245 is a wasteful number, since it uses less digits than its factorization.

261106245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222 (or 1219 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 261106245 is about 16158.7822870413. The cubic root of 261106245 is about 639.1543559457.

The spelling of 261106245 in words is "two hundred sixty-one million, one hundred six thousand, two hundred forty-five".