261071 has 2 divisors, whose sum is σ = 261072. Its totient is φ = 261070.

The previous prime is 261061. The next prime is 261077. The reversal of 261071 is 170162.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261071 - 2¹⁰ = 260047 is a prime.

It is a Chen prime.

It is equal to p₂₂₉₂₂ and since 261071 and 22922 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 261071.

It is not a weakly prime, because it can be changed into another prime (261077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130535 + 130536.

It is an arithmetic number, because the mean of its divisors is an integer number (130536).

2²⁶¹⁰⁷¹ is an apocalyptic number.

261071 is a deficient number, since it is larger than the sum of its proper divisors (1).

261071 is an equidigital number, since it uses as much as digits as its factorization.

261071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 261071 is about 510.9510739787. The cubic root of 261071 is about 63.9125596249.

Subtracting from 261071 its reverse (170162), we obtain a palindrome (90909).

The spelling of 261071 in words is "two hundred sixty-one thousand, seventy-one".