401126809 has 2 divisors, whose sum is σ = 401126810. Its totient is φ = 401126808.

The previous prime is 401126779. The next prime is 401126813. The reversal of 401126809 is 908621104.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 339849225 + 61277584 = 18435^2 + 7828^2 .

It is a cyclic number.

It is not a de Polignac number, because 401126809 - 2⁵ = 401126777 is a prime.

It is not a weakly prime, because it can be changed into another prime (401126839) 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, 200563404 + 200563405.

It is an arithmetic number, because the mean of its divisors is an integer number (200563405).

Almost surely, 2^401126809 is an apocalyptic number.

It is an amenable number.

401126809 is a deficient number, since it is larger than the sum of its proper divisors (1).

401126809 is an equidigital number, since it uses as much as digits as its factorization.

401126809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 401126809 is about 20028.1504138550. The cubic root of 401126809 is about 737.4975177164.

The spelling of 401126809 in words is "four hundred one million, one hundred twenty-six thousand, eight hundred nine".