261412617 has 4 divisors (see below), whose sum is σ = 348550160. Its totient is φ = 174275076.

The previous prime is 261412607. The next prime is 261412631. The reversal of 261412617 is 716214162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 261412617 - 2⁴ = 261412601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261412607) 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, 43568767 + ... + 43568772.

It is an arithmetic number, because the mean of its divisors is an integer number (87137540).

Almost surely, 2^261412617 is an apocalyptic number.

It is an amenable number.

261412617 is a deficient number, since it is larger than the sum of its proper divisors (87137543).

261412617 is an equidigital number, since it uses as much as digits as its factorization.

261412617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87137542.

The product of its digits is 4032, while the sum is 30.

The square root of 261412617 is about 16168.2595538295. The cubic root of 261412617 is about 639.4042445934.

Adding to 261412617 its reverse (716214162), we get a palindrome (977626779).

The spelling of 261412617 in words is "two hundred sixty-one million, four hundred twelve thousand, six hundred seventeen".