261027365 has 4 divisors (see below), whose sum is σ = 313232844. Its totient is φ = 208821888.

The previous prime is 261027343. The next prime is 261027397. The reversal of 261027365 is 563720162.

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

It can be written as a sum of positive squares in 2 ways, for example, as 170720356 + 90307009 = 13066^2 + 9503^2 .

It is a cyclic number.

It is not a de Polignac number, because 261027365 - 2¹⁰ = 261026341 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 26102732 + ... + 26102741.

It is an arithmetic number, because the mean of its divisors is an integer number (78308211).

Almost surely, 2^261027365 is an apocalyptic number.

It is an amenable number.

261027365 is a deficient number, since it is larger than the sum of its proper divisors (52205479).

261027365 is an equidigital number, since it uses as much as digits as its factorization.

261027365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52205478.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 261027365 is about 16156.3413246935. The cubic root of 261027365 is about 639.0899867801.

The spelling of 261027365 in words is "two hundred sixty-one million, twenty-seven thousand, three hundred sixty-five".