181125861 has 16 divisors (see below), whose sum is σ = 276952704. Its totient is φ = 103143744.

The previous prime is 181125853. The next prime is 181125863. The reversal of 181125861 is 168521181.

It is not a de Polignac number, because 181125861 - 2³ = 181125853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181125863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8566 + ... + 20871.

It is an arithmetic number, because the mean of its divisors is an integer number (17309544).

Almost surely, 2^181125861 is an apocalyptic number.

It is an amenable number.

181125861 is a deficient number, since it is larger than the sum of its proper divisors (95826843).

181125861 is a wasteful number, since it uses less digits than its factorization.

181125861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29740.

The product of its digits is 3840, while the sum is 33.

The square root of 181125861 is about 13458.3008214262. The cubic root of 181125861 is about 565.7963667486.

It can be divided in two parts, 1811 and 25861, that added together give a palindrome (27672).

The spelling of 181125861 in words is "one hundred eighty-one million, one hundred twenty-five thousand, eight hundred sixty-one".