261684167 has 2 divisors, whose sum is σ = 261684168. Its totient is φ = 261684166.

The previous prime is 261684149. The next prime is 261684191. The reversal of 261684167 is 761486162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261684167 - 2⁸ = 261683911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261644167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130842083 + 130842084.

It is an arithmetic number, because the mean of its divisors is an integer number (130842084).

Almost surely, 2^261684167 is an apocalyptic number.

261684167 is a deficient number, since it is larger than the sum of its proper divisors (1).

261684167 is an equidigital number, since it uses as much as digits as its factorization.

261684167 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 41.

The square root of 261684167 is about 16176.6550003392. The cubic root of 261684167 is about 639.6255679278.

The spelling of 261684167 in words is "two hundred sixty-one million, six hundred eighty-four thousand, one hundred sixty-seven".