261536045 has 16 divisors (see below), whose sum is σ = 331098240. Its totient is φ = 197774784.

The previous prime is 261536039. The next prime is 261536101. The reversal of 261536045 is 540635162.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261536045 is a prime.

It is a super-2 number, since 2×261536045² = 136802205668484050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43439 + ... + 49091.

It is an arithmetic number, because the mean of its divisors is an integer number (20693640).

Almost surely, 2^261536045 is an apocalyptic number.

It is an amenable number.

261536045 is a deficient number, since it is larger than the sum of its proper divisors (69562195).

261536045 is a wasteful number, since it uses less digits than its factorization.

261536045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6164.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 261536045 is about 16172.0760881218. The cubic root of 261536045 is about 639.5048619881.

The spelling of 261536045 in words is "two hundred sixty-one million, five hundred thirty-six thousand, forty-five".