261166119 has 4 divisors (see below), whose sum is σ = 348221496. Its totient is φ = 174110744.

The previous prime is 261166117. The next prime is 261166183. The reversal of 261166119 is 911661162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261166119 - 2¹ = 261166117 is a prime.

It is a super-2 number, since 2×261166119² = 136415483427044322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261166119.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261166117) 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 in 3 ways as a sum of consecutive naturals, for example, 43527684 + ... + 43527689.

It is an arithmetic number, because the mean of its divisors is an integer number (87055374).

Almost surely, 2^261166119 is an apocalyptic number.

261166119 is a deficient number, since it is larger than the sum of its proper divisors (87055377).

261166119 is an equidigital number, since it uses as much as digits as its factorization.

261166119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87055376.

The product of its digits is 3888, while the sum is 33.

The square root of 261166119 is about 16160.6348575791. The cubic root of 261166119 is about 639.2032068176.

The spelling of 261166119 in words is "two hundred sixty-one million, one hundred sixty-six thousand, one hundred nineteen".