261846261 has 12 divisors (see below), whose sum is σ = 378861600. Its totient is φ = 174269160.

The previous prime is 261846229. The next prime is 261846269. The reversal of 261846261 is 162648162.

261846261 is a `hidden beast` number, since 26 + 1 + 8 + 4 + 626 + 1 = 666.

It is not a de Polignac number, because 261846261 - 2⁵ = 261846229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261846269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18895 + ... + 29676.

It is an arithmetic number, because the mean of its divisors is an integer number (31571800).

Almost surely, 2^261846261 is an apocalyptic number.

It is an amenable number.

261846261 is a deficient number, since it is larger than the sum of its proper divisors (117015339).

261846261 is a wasteful number, since it uses less digits than its factorization.

261846261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49176 (or 49173 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 261846261 is about 16181.6643457958. The cubic root of 261846261 is about 639.7576075898.

The spelling of 261846261 in words is "two hundred sixty-one million, eight hundred forty-six thousand, two hundred sixty-one".