261622301 has 4 divisors (see below), whose sum is σ = 268693212. Its totient is φ = 254551392.

The previous prime is 261622247. The next prime is 261622307. The reversal of 261622301 is 103226162.

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 235622500 + 25999801 = 15350^2 + 5099^2 .

It is a cyclic number.

It is not a de Polignac number, because 261622301 - 2²² = 257427997 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 (261622307) 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, 3535400 + ... + 3535473.

It is an arithmetic number, because the mean of its divisors is an integer number (67173303).

Almost surely, 2^261622301 is an apocalyptic number.

It is an amenable number.

261622301 is a deficient number, since it is larger than the sum of its proper divisors (7070911).

261622301 is an equidigital number, since it uses as much as digits as its factorization.

261622301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7070910.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 261622301 is about 16174.7426872887. The cubic root of 261622301 is about 639.5751583130.

Adding to 261622301 its reverse (103226162), we get a palindrome (364848463).

The spelling of 261622301 in words is "two hundred sixty-one million, six hundred twenty-two thousand, three hundred one".