8181261 has 24 divisors (see below), whose sum is σ = 13455936. Its totient is φ = 4741440.

The previous prime is 8181253. The next prime is 8181269. The reversal of 8181261 is 1621818.

8181261 = T₇₀ + T₇₁ + ... + T₃₆₆.

8181261 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (8181253) and next prime (8181269).

It is not a de Polignac number, because 8181261 - 2³ = 8181253 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8181269) 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 23 ways as a sum of consecutive naturals, for example, 481 + ... + 4073.

It is an arithmetic number, because the mean of its divisors is an integer number (560664).

Almost surely, 2^8181261 is an apocalyptic number.

It is an amenable number.

8181261 is a deficient number, since it is larger than the sum of its proper divisors (5274675).

8181261 is a wasteful number, since it uses less digits than its factorization.

8181261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3633 (or 3630 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 8181261 is about 2860.2903698751. The cubic root of 8181261 is about 201.4992416237.

The spelling of 8181261 in words is "eight million, one hundred eighty-one thousand, two hundred sixty-one".