261220246 has 32 divisors (see below), whose sum is σ = 491880960. Its totient is φ = 101445696.

The previous prime is 261220217. The next prime is 261220273. The reversal of 261220246 is 642022162.

261220246 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 261220246.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 15231 + ... + 27466.

It is an arithmetic number, because the mean of its divisors is an integer number (15371280).

Almost surely, 2^261220246 is an apocalyptic number.

261220246 is a deficient number, since it is larger than the sum of its proper divisors (230660714).

261220246 is a wasteful number, since it uses less digits than its factorization.

261220246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42748.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 261220246 is about 16162.3094265640. The cubic root of 261220246 is about 639.2473623181.

The spelling of 261220246 in words is "two hundred sixty-one million, two hundred twenty thousand, two hundred forty-six".