261356198 has 8 divisors (see below), whose sum is σ = 415095192. Its totient is φ = 122991136.

The previous prime is 261356141. The next prime is 261356203. The reversal of 261356198 is 891653162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3843440 + ... + 3843507.

It is an arithmetic number, because the mean of its divisors is an integer number (51886899).

Almost surely, 2^261356198 is an apocalyptic number.

261356198 is a deficient number, since it is larger than the sum of its proper divisors (153738994).

261356198 is a wasteful number, since it uses less digits than its factorization.

261356198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7686966.

The product of its digits is 77760, while the sum is 41.

The square root of 261356198 is about 16166.5147140625. The cubic root of 261356198 is about 639.3582417850.

The spelling of 261356198 in words is "two hundred sixty-one million, three hundred fifty-six thousand, one hundred ninety-eight".