261143606 has 8 divisors (see below), whose sum is σ = 391848744. Its totient is φ = 130527360.

The previous prime is 261143593. The next prime is 261143629. The reversal of 261143606 is 606341162.

It is a happy number.

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, 14315 + ... + 26966.

It is an arithmetic number, because the mean of its divisors is an integer number (48981093).

Almost surely, 2^261143606 is an apocalyptic number.

261143606 is a deficient number, since it is larger than the sum of its proper divisors (130705138).

261143606 is a wasteful number, since it uses less digits than its factorization.

261143606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44446.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 261143606 is about 16159.9383043377. The cubic root of 261143606 is about 639.1848394590.

Adding to 261143606 its reverse (606341162), we get a palindrome (867484768).

The spelling of 261143606 in words is "two hundred sixty-one million, one hundred forty-three thousand, six hundred six".