181125681 has 8 divisors (see below), whose sum is σ = 263455584. Its totient is φ = 109773120.

The previous prime is 181125673. The next prime is 181125731. The reversal of 181125681 is 186521181.

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

It is not a de Polignac number, because 181125681 - 2³ = 181125673 is a prime.

It is a super-2 number, since 2×181125681² = 65613024635427522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 5488657 = 181125681 / (1 + 8 + 1 + 1 + 2 + 5 + 6 + 8 + 1).

It is not an unprimeable number, because it can be changed into a prime (181125601) 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 7 ways as a sum of consecutive naturals, for example, 2744296 + ... + 2744361.

It is an arithmetic number, because the mean of its divisors is an integer number (32931948).

Almost surely, 2^181125681 is an apocalyptic number.

181125681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

181125681 is a deficient number, since it is larger than the sum of its proper divisors (82329903).

181125681 is a wasteful number, since it uses less digits than its factorization.

181125681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5488671.

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

The square root of 181125681 is about 13458.2941341018. The cubic root of 181125681 is about 565.7961793220.

The spelling of 181125681 in words is "one hundred eighty-one million, one hundred twenty-five thousand, six hundred eighty-one".