151181 has 4 divisors (see below), whose sum is σ = 160092. Its totient is φ = 142272.

The previous prime is 151171. The next prime is 151189. The reversal of 151181 is 181151.

151181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 181151 = 107 ⋅1693.

It can be written as a sum of positive squares in 2 ways, for example, as 67081 + 84100 = 259^2 + 290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-151181 is a prime.

It is a super-2 number, since 2×151181² = 45711389522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 8893 = 151181 / (1 + 5 + 1 + 1 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 151181.

It is not an unprimeable number, because it can be changed into a prime (151189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4430 + ... + 4463.

It is an arithmetic number, because the mean of its divisors is an integer number (40023).

2¹⁵¹¹⁸¹ is an apocalyptic number.

It is an amenable number.

151181 is a deficient number, since it is larger than the sum of its proper divisors (8911).

151181 is an equidigital number, since it uses as much as digits as its factorization.

151181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8910.

The product of its digits is 40, while the sum is 17.

The square root of 151181 is about 388.8200097732. The cubic root of 151181 is about 53.2720085063.

The spelling of 151181 in words is "one hundred fifty-one thousand, one hundred eighty-one".