261682559 has 4 divisors (see below), whose sum is σ = 261730560. Its totient is φ = 261634560.

The previous prime is 261682543. The next prime is 261682601. The reversal of 261682559 is 955286162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 955286162 = 2 ⋅477643081.

It is a cyclic number.

It is not a de Polignac number, because 261682559 - 2⁴ = 261682543 is a prime.

It is a Duffinian number.

261682559 is a Rhonda number in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261682529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14594 + ... + 27135.

It is an arithmetic number, because the mean of its divisors is an integer number (65432640).

Almost surely, 2^261682559 is an apocalyptic number.

261682559 is a deficient number, since it is larger than the sum of its proper divisors (48001).

261682559 is an equidigital number, since it uses as much as digits as its factorization.

261682559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48000.

The product of its digits is 259200, while the sum is 44.

The square root of 261682559 is about 16176.6052990113. The cubic root of 261682559 is about 639.6242577988.

The spelling of 261682559 in words is "two hundred sixty-one million, six hundred eighty-two thousand, five hundred fifty-nine".