261361726 has 16 divisors (see below), whose sum is σ = 397774080. Its totient is φ = 128783520.

The previous prime is 261361679. The next prime is 261361733. The reversal of 261361726 is 627163162.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 261361691 and 261361700.

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, 38500 + ... + 44776.

It is an arithmetic number, because the mean of its divisors is an integer number (24860880).

Almost surely, 2^261361726 is an apocalyptic number.

261361726 is a deficient number, since it is larger than the sum of its proper divisors (136412354).

261361726 is a wasteful number, since it uses less digits than its factorization.

261361726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6579.

The product of its digits is 18144, while the sum is 34.

The square root of 261361726 is about 16166.6856838376. The cubic root of 261361726 is about 639.3627494868.

The spelling of 261361726 in words is "two hundred sixty-one million, three hundred sixty-one thousand, seven hundred twenty-six".