261201536 has 32 divisors (see below), whose sum is σ = 537156480. Its totient is φ = 126385920.

The previous prime is 261201517. The next prime is 261201539. The reversal of 261201536 is 635102162.

261201536 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (261201539) 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, 28946 + ... + 36881.

It is an arithmetic number, because the mean of its divisors is an integer number (16786140).

Almost surely, 2^261201536 is an apocalyptic number.

It is an amenable number.

261201536 is an abundant number, since it is smaller than the sum of its proper divisors (275954944).

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

261201536 is an equidigital number, since it uses as much as digits as its factorization.

261201536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65872 (or 65860 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 261201536 is about 16161.7306004029. The cubic root of 261201536 is about 639.2320998414.

Adding to 261201536 its reverse (635102162), we get a palindrome (896303698).

The spelling of 261201536 in words is "two hundred sixty-one million, two hundred one thousand, five hundred thirty-six".