265181161 has 16 divisors (see below), whose sum is σ = 314634240. Its totient is φ = 218705040.

The previous prime is 265181159. The next prime is 265181167. The reversal of 265181161 is 161181562.

It is a cyclic number.

It is not a de Polignac number, because 265181161 - 2¹ = 265181159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (265181167) 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 in 15 ways as a sum of consecutive naturals, for example, 35430 + ... + 42256.

It is an arithmetic number, because the mean of its divisors is an integer number (19664640).

Almost surely, 2^265181161 is an apocalyptic number.

It is an amenable number.

265181161 is a deficient number, since it is larger than the sum of its proper divisors (49453079).

265181161 is a wasteful number, since it uses less digits than its factorization.

265181161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7044.

The product of its digits is 2880, while the sum is 31.

The square root of 265181161 is about 16284.3839613293. The cubic root of 265181161 is about 642.4621635377.

The spelling of 265181161 in words is "two hundred sixty-five million, one hundred eighty-one thousand, one hundred sixty-one".