261216301 has 4 divisors (see below), whose sum is σ = 261263772. Its totient is φ = 261168832.

The previous prime is 261216269. The next prime is 261216331. The reversal of 261216301 is 103612162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 150651076 + 110565225 = 12274^2 + 10515^2 .

It is a cyclic number.

It is not a de Polignac number, because 261216301 - 2⁵ = 261216269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261216331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14206 + ... + 26911.

It is an arithmetic number, because the mean of its divisors is an integer number (65315943).

Almost surely, 2^261216301 is an apocalyptic number.

It is an amenable number.

261216301 is a deficient number, since it is larger than the sum of its proper divisors (47471).

261216301 is an equidigital number, since it uses as much as digits as its factorization.

261216301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47470.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 261216301 is about 16162.1873829009. The cubic root of 261216301 is about 639.2441442884.

Adding to 261216301 its reverse (103612162), we get a palindrome (364828463).

The spelling of 261216301 in words is "two hundred sixty-one million, two hundred sixteen thousand, three hundred one".