261216183 has 8 divisors (see below), whose sum is σ = 353486848. Its totient is φ = 171544824.

The previous prime is 261216181. The next prime is 261216191. The reversal of 261216183 is 381612162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261216183 - 2¹ = 261216181 is a prime.

It is a super-2 number, since 2×261216183² = 136467788522178978, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261216183.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261216181) 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 7 ways as a sum of consecutive naturals, for example, 649591 + ... + 649992.

It is an arithmetic number, because the mean of its divisors is an integer number (44185856).

Almost surely, 2^261216183 is an apocalyptic number.

261216183 is a deficient number, since it is larger than the sum of its proper divisors (92270665).

261216183 is a wasteful number, since it uses less digits than its factorization.

261216183 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299653.

The product of its digits is 3456, while the sum is 30.

The square root of 261216183 is about 16162.1837324045. The cubic root of 261216183 is about 639.2440480325.

The spelling of 261216183 in words is "two hundred sixty-one million, two hundred sixteen thousand, one hundred eighty-three".