261105198 has 16 divisors (see below), whose sum is σ = 529566336. Its totient is φ = 85809080.

The previous prime is 261105137. The next prime is 261105203. The reversal of 261105198 is 891501162.

It is a congruent number.

It is an unprimeable 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 in 7 ways as a sum of consecutive naturals, for example, 306036 + ... + 306887.

It is an arithmetic number, because the mean of its divisors is an integer number (33097896).

Almost surely, 2^261105198 is an apocalyptic number.

261105198 is an abundant number, since it is smaller than the sum of its proper divisors (268461138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261105198 is a wasteful number, since it uses less digits than its factorization.

261105198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612999.

The product of its (nonzero) digits is 4320, while the sum is 33.

The square root of 261105198 is about 16158.7498897656. The cubic root of 261105198 is about 639.1535016377.

The spelling of 261105198 in words is "two hundred sixty-one million, one hundred five thousand, one hundred ninety-eight".