261198368 has 18 divisors (see below), whose sum is σ = 514414341. Its totient is φ = 130553472.

The previous prime is 261198367. The next prime is 261198403. The reversal of 261198368 is 863891162.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

261198368 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 253064464 + 8133904 = 15908^2 + 2852^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=11428.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261198367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 89996 + ... + 92852.

Almost surely, 2^261198368 is an apocalyptic number.

It is an amenable number.

261198368 is a deficient number, since it is larger than the sum of its proper divisors (253215973).

261198368 is an frugal number, since it uses more digits than its factorization.

261198368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5724 (or 2859 counting only the distinct ones).

The product of its digits is 124416, while the sum is 44.

The square root of 261198368 is about 16161.6325907997. The cubic root of 261198368 is about 639.2295155081.

The spelling of 261198368 in words is "two hundred sixty-one million, one hundred ninety-eight thousand, three hundred sixty-eight".