401126581 has 2 divisors, whose sum is σ = 401126582. Its totient is φ = 401126580.

The previous prime is 401126573. The next prime is 401126597. The reversal of 401126581 is 185621104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 353101681 + 48024900 = 18791^2 + 6930^2 .

It is a cyclic number.

It is not a de Polignac number, because 401126581 - 2³ = 401126573 is a prime.

It is a super-2 number, since 2×401126581² = 321805067969499122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401126501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200563290 + 200563291.

It is an arithmetic number, because the mean of its divisors is an integer number (200563291).

Almost surely, 2^401126581 is an apocalyptic number.

It is an amenable number.

401126581 is a deficient number, since it is larger than the sum of its proper divisors (1).

401126581 is an equidigital number, since it uses as much as digits as its factorization.

401126581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 401126581 is about 20028.1447218658. The cubic root of 401126581 is about 737.4973779855.

Adding to 401126581 its reverse (185621104), we get a palindrome (586747685).

The spelling of 401126581 in words is "four hundred one million, one hundred twenty-six thousand, five hundred eighty-one".