261760069 has 2 divisors, whose sum is σ = 261760070. Its totient is φ = 261760068.

The previous prime is 261760043. The next prime is 261760091. The reversal of 261760069 is 960067162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 239320900 + 22439169 = 15470^2 + 4737^2 .

It is a cyclic number.

It is not a de Polignac number, because 261760069 - 2¹³ = 261751877 is a prime.

It is a super-2 number, since 2×261760069² = 137036667445769522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261760099) 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 as a sum of consecutive naturals, namely, 130880034 + 130880035.

It is an arithmetic number, because the mean of its divisors is an integer number (130880035).

Almost surely, 2^261760069 is an apocalyptic number.

It is an amenable number.

261760069 is a deficient number, since it is larger than the sum of its proper divisors (1).

261760069 is an equidigital number, since it uses as much as digits as its factorization.

261760069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 261760069 is about 16179.0008653192. Note that the first 3 decimals coincide. The cubic root of 261760069 is about 639.6874034951.

The spelling of 261760069 in words is "two hundred sixty-one million, seven hundred sixty thousand, sixty-nine".