261332201 has 16 divisors (see below), whose sum is σ = 291260928. Its totient is φ = 232848000.

The previous prime is 261332191. The next prime is 261332219. The reversal of 261332201 is 102233162.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261332201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261332231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248126 + ... + 249176.

It is an arithmetic number, because the mean of its divisors is an integer number (18203808).

Almost surely, 2^261332201 is an apocalyptic number.

It is an amenable number.

261332201 is a deficient number, since it is larger than the sum of its proper divisors (29928727).

261332201 is a wasteful number, since it uses less digits than its factorization.

261332201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1712.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 261332201 is about 16165.7725147919. The cubic root of 261332201 is about 639.3386731536.

Adding to 261332201 its reverse (102233162), we get a palindrome (363565363).

The spelling of 261332201 in words is "two hundred sixty-one million, three hundred thirty-two thousand, two hundred one".