261356827 has 4 divisors (see below), whose sum is σ = 276730776. Its totient is φ = 245982880.

The previous prime is 261356807. The next prime is 261356831. The reversal of 261356827 is 728653162.

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

It is a cyclic number.

It is not a de Polignac number, because 261356827 - 2⁷ = 261356699 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261356827.

It is not an unprimeable number, because it can be changed into a prime (261356807) 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, 7686949 + ... + 7686982.

It is an arithmetic number, because the mean of its divisors is an integer number (69182694).

Almost surely, 2^261356827 is an apocalyptic number.

261356827 is a deficient number, since it is larger than the sum of its proper divisors (15373949).

261356827 is a wasteful number, since it uses less digits than its factorization.

261356827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15373948.

The product of its digits is 120960, while the sum is 40.

The square root of 261356827 is about 16166.5341678419. The cubic root of 261356827 is about 639.3587546942.

The spelling of 261356827 in words is "two hundred sixty-one million, three hundred fifty-six thousand, eight hundred twenty-seven".