401326501 has 4 divisors (see below), whose sum is σ = 401368492. Its totient is φ = 401284512.

The previous prime is 401326487. The next prime is 401326507. The reversal of 401326501 is 105623104.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 188925025 + 212401476 = 13745^2 + 14574^2 .

It is a cyclic number.

It is not a de Polignac number, because 401326501 - 2⁵ = 401326469 is a prime.

It is a super-2 number, since 2×401326501² = 322125920809806002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401326507) 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 in 3 ways as a sum of consecutive naturals, for example, 1075 + ... + 28351.

It is an arithmetic number, because the mean of its divisors is an integer number (100342123).

Almost surely, 2^401326501 is an apocalyptic number.

It is an amenable number.

401326501 is a deficient number, since it is larger than the sum of its proper divisors (41991).

401326501 is a wasteful number, since it uses less digits than its factorization.

401326501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41990.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 401326501 is about 20033.1350766674. The cubic root of 401326501 is about 737.6198796221.

Adding to 401326501 its reverse (105623104), we get a palindrome (506949605).

The spelling of 401326501 in words is "four hundred one million, three hundred twenty-six thousand, five hundred one".