261648194 has 8 divisors (see below), whose sum is σ = 395563008. Its totient is φ = 129793860.

The previous prime is 261648143. The next prime is 261648197. The reversal of 261648194 is 491846162.

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

It is not an unprimeable number, because it can be changed into a prime (261648197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 514802 + ... + 515309.

It is an arithmetic number, because the mean of its divisors is an integer number (49445376).

Almost surely, 2^261648194 is an apocalyptic number.

261648194 is a deficient number, since it is larger than the sum of its proper divisors (133914814).

261648194 is a wasteful number, since it uses less digits than its factorization.

261648194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030240.

The product of its digits is 82944, while the sum is 41.

The square root of 261648194 is about 16175.5430820730. The cubic root of 261648194 is about 639.5962573977.

The spelling of 261648194 in words is "two hundred sixty-one million, six hundred forty-eight thousand, one hundred ninety-four".