261027261 has 24 divisors (see below), whose sum is σ = 411840000. Its totient is φ = 157996800.

The previous prime is 261027259. The next prime is 261027293. The reversal of 261027261 is 162720162.

261027261 is a `hidden beast` number, since 2 + 610 + 27 + 26 + 1 = 666.

It is not a de Polignac number, because 261027261 - 2¹ = 261027259 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261027241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122596 + ... + 124706.

It is an arithmetic number, because the mean of its divisors is an integer number (17160000).

Almost surely, 2^261027261 is an apocalyptic number.

It is an amenable number.

261027261 is a deficient number, since it is larger than the sum of its proper divisors (150812739).

261027261 is a wasteful number, since it uses less digits than its factorization.

261027261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3377 (or 3374 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 261027261 is about 16156.3381061427. The cubic root of 261027261 is about 639.0899019035.

The spelling of 261027261 in words is "two hundred sixty-one million, twenty-seven thousand, two hundred sixty-one".