261536622 has 16 divisors (see below), whose sum is σ = 535831632. Its totient is φ = 85052480.

The previous prime is 261536591. The next prime is 261536647. The reversal of 261536622 is 226635162.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 531333 + ... + 531824.

It is an arithmetic number, because the mean of its divisors is an integer number (33489477).

Almost surely, 2^261536622 is an apocalyptic number.

261536622 is an abundant number, since it is smaller than the sum of its proper divisors (274295010).

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

261536622 is a wasteful number, since it uses less digits than its factorization.

261536622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063203.

The product of its digits is 25920, while the sum is 33.

The square root of 261536622 is about 16172.0939275036. The cubic root of 261536622 is about 639.5053322790.

The spelling of 261536622 in words is "two hundred sixty-one million, five hundred thirty-six thousand, six hundred twenty-two".