401544331 has 2 divisors, whose sum is σ = 401544332. Its totient is φ = 401544330.

The previous prime is 401544329. The next prime is 401544343. The reversal of 401544331 is 133445104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 401544331 - 2¹ = 401544329 is a prime.

It is a super-2 number, since 2×401544331² = 322475699516475122, which contains 22 as substring.

Together with 401544329, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 401544296 and 401544305.

It is not a weakly prime, because it can be changed into another prime (401544371) 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 as a sum of consecutive naturals, namely, 200772165 + 200772166.

It is an arithmetic number, because the mean of its divisors is an integer number (200772166).

Almost surely, 2^401544331 is an apocalyptic number.

401544331 is a deficient number, since it is larger than the sum of its proper divisors (1).

401544331 is an equidigital number, since it uses as much as digits as its factorization.

401544331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 401544331 is about 20038.5710817912. The cubic root of 401544331 is about 737.7533093661.

Adding to 401544331 its reverse (133445104), we get a palindrome (534989435).

The spelling of 401544331 in words is "four hundred one million, five hundred forty-four thousand, three hundred thirty-one".