401091 has 4 divisors (see below), whose sum is σ = 534792. Its totient is φ = 267392.

The previous prime is 401087. The next prime is 401101. The reversal of 401091 is 190104.

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

It is a cyclic number.

It is not a de Polignac number, because 401091 - 2² = 401087 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 401091.

It is not an unprimeable number, because it can be changed into a prime (402091) 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, 66846 + ... + 66851.

It is an arithmetic number, because the mean of its divisors is an integer number (133698).

2⁴⁰¹⁰⁹¹ is an apocalyptic number.

401091 is a deficient number, since it is larger than the sum of its proper divisors (133701).

401091 is a wasteful number, since it uses less digits than its factorization.

401091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133700.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 401091 is about 633.3174559413. The cubic root of 401091 is about 73.7475571344.

Adding to 401091 its reverse (190104), we get a palindrome (591195).

The spelling of 401091 in words is "four hundred one thousand, ninety-one".