401020001 has 4 divisors (see below), whose sum is σ = 402000900. Its totient is φ = 400039104.

The previous prime is 401019989. The next prime is 401020003. The reversal of 401020001 is 100020104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 288150625 + 112869376 = 16975^2 + 10624^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401020001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (401020003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 489836 + ... + 490653.

It is an arithmetic number, because the mean of its divisors is an integer number (100500225).

Almost surely, 2^401020001 is an apocalyptic number.

It is an amenable number.

401020001 is a deficient number, since it is larger than the sum of its proper divisors (980899).

401020001 is an equidigital number, since it uses as much as digits as its factorization.

401020001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980898.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 401020001 is about 20025.4837894119. The cubic root of 401020001 is about 737.4320541061.

Adding to 401020001 its reverse (100020104), we get a palindrome (501040105).

The spelling of 401020001 in words is "four hundred one million, twenty thousand, one".