261109183 has 2 divisors, whose sum is σ = 261109184. Its totient is φ = 261109182.

The previous prime is 261109169. The next prime is 261109193. The reversal of 261109183 is 381901162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261109183 - 2⁵ = 261109151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261109193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130554591 + 130554592.

It is an arithmetic number, because the mean of its divisors is an integer number (130554592).

Almost surely, 2^261109183 is an apocalyptic number.

261109183 is a deficient number, since it is larger than the sum of its proper divisors (1).

261109183 is an equidigital number, since it uses as much as digits as its factorization.

261109183 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 261109183 is about 16158.8731971013. The cubic root of 261109183 is about 639.1567532182.

The spelling of 261109183 in words is "two hundred sixty-one million, one hundred nine thousand, one hundred eighty-three".