261023255 has 16 divisors (see below), whose sum is σ = 323846400. Its totient is φ = 201761280.

The previous prime is 261023239. The next prime is 261023263. The reversal of 261023255 is 552320162.

It is not a de Polignac number, because 261023255 - 2⁴ = 261023239 is a prime.

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, 155561 + ... + 157229.

It is an arithmetic number, because the mean of its divisors is an integer number (20240400).

Almost surely, 2^261023255 is an apocalyptic number.

261023255 is a deficient number, since it is larger than the sum of its proper divisors (62823145).

261023255 is a wasteful number, since it uses less digits than its factorization.

261023255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2714.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 261023255 is about 16156.2141295540. The cubic root of 261023255 is about 639.0866325039.

The spelling of 261023255 in words is "two hundred sixty-one million, twenty-three thousand, two hundred fifty-five".