261600823 has 16 divisors (see below), whose sum is σ = 289382400. Its totient is φ = 234511200.

The previous prime is 261600821. The next prime is 261600839. The reversal of 261600823 is 328006162.

It is not a de Polignac number, because 261600823 - 2¹ = 261600821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261600791 and 261600800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261600821) 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 15 ways as a sum of consecutive naturals, for example, 277533 + ... + 278473.

It is an arithmetic number, because the mean of its divisors is an integer number (18086400).

Almost surely, 2^261600823 is an apocalyptic number.

261600823 is a deficient number, since it is larger than the sum of its proper divisors (27781577).

261600823 is a wasteful number, since it uses less digits than its factorization.

261600823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 261600823 is about 16174.0787372883. The cubic root of 261600823 is about 639.5576557643.

Adding to 261600823 its reverse (328006162), we get a palindrome (589606985).

The spelling of 261600823 in words is "two hundred sixty-one million, six hundred thousand, eight hundred twenty-three".