261443167 has 2 divisors, whose sum is σ = 261443168. Its totient is φ = 261443166.

The previous prime is 261443141. The next prime is 261443191. The reversal of 261443167 is 761344162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261443167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261440167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130721583 + 130721584.

It is an arithmetic number, because the mean of its divisors is an integer number (130721584).

Almost surely, 2^261443167 is an apocalyptic number.

261443167 is a deficient number, since it is larger than the sum of its proper divisors (1).

261443167 is an equidigital number, since it uses as much as digits as its factorization.

261443167 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 34.

The square root of 261443167 is about 16169.2042785042. The cubic root of 261443167 is about 639.4291516274.

The spelling of 261443167 in words is "two hundred sixty-one million, four hundred forty-three thousand, one hundred sixty-seven".