261275255 has 4 divisors (see below), whose sum is σ = 313530312. Its totient is φ = 209020200.

The previous prime is 261275233. The next prime is 261275257. The reversal of 261275255 is 552572162.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-261275255 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 (261275257) 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 3 ways as a sum of consecutive naturals, for example, 26127521 + ... + 26127530.

It is an arithmetic number, because the mean of its divisors is an integer number (78382578).

Almost surely, 2^261275255 is an apocalyptic number.

261275255 is a deficient number, since it is larger than the sum of its proper divisors (52255057).

261275255 is an equidigital number, since it uses as much as digits as its factorization.

261275255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52255056.

The product of its digits is 42000, while the sum is 35.

The square root of 261275255 is about 16164.0111049207. The cubic root of 261275255 is about 639.2922310838.

The spelling of 261275255 in words is "two hundred sixty-one million, two hundred seventy-five thousand, two hundred fifty-five".