401081 has 4 divisors (see below), whose sum is σ = 424692. Its totient is φ = 377472.

The previous prime is 401077. The next prime is 401087. The reversal of 401081 is 180104.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 160000 + 241081 = 400^2 + 491^2 .

It is a cyclic number.

It is not a de Polignac number, because 401081 - 2² = 401077 is a prime.

It is a super-2 number, since 2×401081² = 321731937122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (401087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11780 + ... + 11813.

It is an arithmetic number, because the mean of its divisors is an integer number (106173).

2⁴⁰¹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

401081 is a deficient number, since it is larger than the sum of its proper divisors (23611).

401081 is a wasteful number, since it uses less digits than its factorization.

401081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23610.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 401081 is about 633.3095609574. The cubic root of 401081 is about 73.7469442380.

Adding to 401081 its reverse (180104), we get a palindrome (581185).

The spelling of 401081 in words is "four hundred one thousand, eighty-one".