261828359 has 4 divisors (see below), whose sum is σ = 281969016. Its totient is φ = 241687704.

The previous prime is 261828353. The next prime is 261828377. The reversal of 261828359 is 953828162.

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 261828359 - 2⁸ = 261828103 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 (261828353) by changing a digit.

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, 10070309 + ... + 10070334.

It is an arithmetic number, because the mean of its divisors is an integer number (70492254).

Almost surely, 2^261828359 is an apocalyptic number.

261828359 is a deficient number, since it is larger than the sum of its proper divisors (20140657).

261828359 is a wasteful number, since it uses less digits than its factorization.

261828359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20140656.

The product of its digits is 207360, while the sum is 44.

The square root of 261828359 is about 16181.1111793968. Note that the first 4 decimals coincide. The cubic root of 261828359 is about 639.7430275310.

The spelling of 261828359 in words is "two hundred sixty-one million, eight hundred twenty-eight thousand, three hundred fifty-nine".