261530415 has 24 divisors (see below), whose sum is σ = 467945088. Its totient is φ = 134982720.

The previous prime is 261530411. The next prime is 261530441. The reversal of 261530415 is 514035162.

261530415 is a `hidden beast` number, since 2 + 615 + 3 + 0 + 41 + 5 = 666.

It is not a de Polignac number, because 261530415 - 2² = 261530411 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261530411) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 92344 + ... + 95133.

It is an arithmetic number, because the mean of its divisors is an integer number (19497712).

Almost surely, 2^261530415 is an apocalyptic number.

261530415 is a deficient number, since it is larger than the sum of its proper divisors (206414673).

261530415 is a wasteful number, since it uses less digits than its factorization.

261530415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187519 (or 187516 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 261530415 is about 16171.9020217166. The cubic root of 261530415 is about 639.5002731519.

Adding to 261530415 its reverse (514035162), we get a palindrome (775565577).

The spelling of 261530415 in words is "two hundred sixty-one million, five hundred thirty thousand, four hundred fifteen".