401442001 has 2 divisors, whose sum is σ = 401442002. Its totient is φ = 401442000.

The previous prime is 401441987. The next prime is 401442011. The reversal of 401442001 is 100244104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 400800400 + 641601 = 20020^2 + 801^2 .

It is a cyclic number.

It is not a de Polignac number, because 401442001 - 2¹⁵ = 401409233 is a prime.

It is a super-2 number, since 2×401442001² = 322311360333768002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401442011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200721000 + 200721001.

It is an arithmetic number, because the mean of its divisors is an integer number (200721001).

Almost surely, 2^401442001 is an apocalyptic number.

It is an amenable number.

401442001 is a deficient number, since it is larger than the sum of its proper divisors (1).

401442001 is an equidigital number, since it uses as much as digits as its factorization.

401442001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 401442001 is about 20036.0175933243. The cubic root of 401442001 is about 737.6906340862.

Adding to 401442001 its reverse (100244104), we get a palindrome (501686105).

The spelling of 401442001 in words is "four hundred one million, four hundred forty-two thousand, one".