261153608 has 16 divisors (see below), whose sum is σ = 489839280. Its totient is φ = 130529808.

The previous prime is 261153601. The next prime is 261153619. The reversal of 261153608 is 806351162.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (261153601) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 32435 + ... + 39677.

It is an arithmetic number, because the mean of its divisors is an integer number (30614955).

Almost surely, 2^261153608 is an apocalyptic number.

It is an amenable number.

261153608 is a deficient number, since it is larger than the sum of its proper divisors (228685672).

261153608 is a wasteful number, since it uses less digits than its factorization.

261153608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11756 (or 11752 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 261153608 is about 16160.2477703778. The cubic root of 261153608 is about 639.1929997777.

The spelling of 261153608 in words is "two hundred sixty-one million, one hundred fifty-three thousand, six hundred eight".