401322218581 has 2 divisors, whose sum is σ = 401322218582. Its totient is φ = 401322218580.

The previous prime is 401322218569. The next prime is 401322218617. The reversal of 401322218581 is 185812223104.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 286448673681 + 114873544900 = 535209^2 + 338930^2 .

It is a cyclic number.

It is not a de Polignac number, because 401322218581 - 2¹³ = 401322210389 is a prime.

It is a super-2 number, since 2×401322218581² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 401322218581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401322218681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200661109290 + 200661109291.

It is an arithmetic number, because the mean of its divisors is an integer number (200661109291).

Almost surely, 2^401322218581 is an apocalyptic number.

It is an amenable number.

401322218581 is a deficient number, since it is larger than the sum of its proper divisors (1).

401322218581 is an equidigital number, since it uses as much as digits as its factorization.

401322218581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30720, while the sum is 37.

The spelling of 401322218581 in words is "four hundred one billion, three hundred twenty-two million, two hundred eighteen thousand, five hundred eighty-one".