261012255 has 16 divisors (see below), whose sum is σ = 477279744. Its totient is φ = 119319840.

The previous prime is 261012247. The next prime is 261012277. The reversal of 261012255 is 552210162.

It is a happy number.

It is not a de Polignac number, because 261012255 - 2³ = 261012247 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 (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1242811 + ... + 1243020.

It is an arithmetic number, because the mean of its divisors is an integer number (29829984).

Almost surely, 2^261012255 is an apocalyptic number.

261012255 is a deficient number, since it is larger than the sum of its proper divisors (216267489).

261012255 is a wasteful number, since it uses less digits than its factorization.

261012255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2485846.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 261012255 is about 16155.8736996796. The cubic root of 261012255 is about 639.0776549491.

The spelling of 261012255 in words is "two hundred sixty-one million, twelve thousand, two hundred fifty-five".