261308 has 6 divisors (see below), whose sum is σ = 457296. Its totient is φ = 130652.

The previous prime is 261301. The next prime is 261323. The reversal of 261308 is 803162.

It is a self number, because there is not a number n which added to its sum of digits gives 261308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261301) by changing a digit.

261308 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32660 + ... + 32667.

It is an arithmetic number, because the mean of its divisors is an integer number (76216).

2²⁶¹³⁰⁸ is an apocalyptic number.

It is an amenable number.

261308 is a deficient number, since it is larger than the sum of its proper divisors (195988).

261308 is a wasteful number, since it uses less digits than its factorization.

261308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65331 (or 65329 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 261308 is about 511.1829418124. The cubic root of 261308 is about 63.9318936955.

The spelling of 261308 in words is "two hundred sixty-one thousand, three hundred eight".