401143681 has 4 divisors (see below), whose sum is σ = 406793664. Its totient is φ = 395493700.

The previous prime is 401143609. The next prime is 401143723. The reversal of 401143681 is 186341104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 401143681 - 2⁷ = 401143553 is a prime.

It is a super-2 number, since 2×401143681² = 321832505612459522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401143081) 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, 2824885 + ... + 2825026.

It is an arithmetic number, because the mean of its divisors is an integer number (101698416).

Almost surely, 2^401143681 is an apocalyptic number.

It is an amenable number.

401143681 is a deficient number, since it is larger than the sum of its proper divisors (5649983).

401143681 is an equidigital number, since it uses as much as digits as its factorization.

401143681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5649982.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 401143681 is about 20028.5716165682. The cubic root of 401143681 is about 737.5078576583.

Adding to 401143681 its reverse (186341104), we get a palindrome (587484785).

The spelling of 401143681 in words is "four hundred one million, one hundred forty-three thousand, six hundred eighty-one".