261550413 has 6 divisors (see below), whose sum is σ = 377795054. Its totient is φ = 174366936.

The previous prime is 261550369. The next prime is 261550417. The reversal of 261550413 is 314055162.

261550413 is a `hidden beast` number, since 2 + 615 + 5 + 0 + 41 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 206152164 + 55398249 = 14358^2 + 7443^2 .

It is not a de Polignac number, because 261550413 - 2⁹ = 261549901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261550417) 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 5 ways as a sum of consecutive naturals, for example, 14530570 + ... + 14530587.

Almost surely, 2^261550413 is an apocalyptic number.

It is an amenable number.

261550413 is a deficient number, since it is larger than the sum of its proper divisors (116244641).

261550413 is a wasteful number, since it uses less digits than its factorization.

261550413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29061163 (or 29061160 counting only the distinct ones).

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

The square root of 261550413 is about 16172.5203045165. The cubic root of 261550413 is about 639.5165725952.

The spelling of 261550413 in words is "two hundred sixty-one million, five hundred fifty thousand, four hundred thirteen".