920181 has 4 divisors (see below), whose sum is σ = 1226912. Its totient is φ = 613452.

The previous prime is 920167. The next prime is 920197. The reversal of 920181 is 181029.

920181 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 181029 = 3 ⋅60343.

It is not a de Polignac number, because 920181 - 2⁵ = 920149 is a prime.

It is a super-2 number, since 2×920181² = 1693466145522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

920181 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (920281) 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, 153361 + ... + 153366.

It is an arithmetic number, because the mean of its divisors is an integer number (306728).

2⁹²⁰¹⁸¹ is an apocalyptic number.

It is an amenable number.

920181 is a deficient number, since it is larger than the sum of its proper divisors (306731).

920181 is a wasteful number, since it uses less digits than its factorization.

920181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306730.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 920181 is about 959.2606527946. The cubic root of 920181 is about 97.2652604130.

The spelling of 920181 in words is "nine hundred twenty thousand, one hundred eighty-one".