261676171 has 2 divisors, whose sum is σ = 261676172. Its totient is φ = 261676170.

The previous prime is 261676157. The next prime is 261676183. The reversal of 261676171 is 171676162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261676171 - 2¹¹ = 261674123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261676171.

It is not a weakly prime, because it can be changed into another prime (261676111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130838085 + 130838086.

It is an arithmetic number, because the mean of its divisors is an integer number (130838086).

Almost surely, 2^261676171 is an apocalyptic number.

261676171 is a deficient number, since it is larger than the sum of its proper divisors (1).

261676171 is an equidigital number, since it uses as much as digits as its factorization.

261676171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 37.

The square root of 261676171 is about 16176.4078521778. The cubic root of 261676171 is about 639.6190530793.

Subtracting from 261676171 its reverse (171676162), we obtain a palindrome (90000009).

It can be divided in two parts, 2616 and 76171, that added together give a palindrome (78787).

The spelling of 261676171 in words is "two hundred sixty-one million, six hundred seventy-six thousand, one hundred seventy-one".