261514321 has 4 divisors (see below), whose sum is σ = 261568692. Its totient is φ = 261459952.

The previous prime is 261514303. The next prime is 261514327. The reversal of 261514321 is 123415162.

It is a happy number.

261514321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 259371025 + 2143296 = 16105^2 + 1464^2 .

It is a cyclic number.

It is not a de Polignac number, because 261514321 - 2⁵ = 261514289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261514327) 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, 19186 + ... + 29851.

It is an arithmetic number, because the mean of its divisors is an integer number (65392173).

Almost surely, 2^261514321 is an apocalyptic number.

It is an amenable number.

261514321 is a deficient number, since it is larger than the sum of its proper divisors (54371).

261514321 is an equidigital number, since it uses as much as digits as its factorization.

261514321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54370.

The product of its digits is 1440, while the sum is 25.

The square root of 261514321 is about 16171.4044226221. The cubic root of 261514321 is about 639.4871550747.

Adding to 261514321 its reverse (123415162), we get a palindrome (384929483).

The spelling of 261514321 in words is "two hundred sixty-one million, five hundred fourteen thousand, three hundred twenty-one".