401001204391 has 2 divisors, whose sum is σ = 401001204392. Its totient is φ = 401001204390.

The previous prime is 401001204353. The next prime is 401001204437. The reversal of 401001204391 is 193402100104.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 401001204391 - 2⁹ = 401001203879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401001207391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200500602195 + 200500602196.

It is an arithmetic number, because the mean of its divisors is an integer number (200500602196).

Almost surely, 2^401001204391 is an apocalyptic number.

401001204391 is a deficient number, since it is larger than the sum of its proper divisors (1).

401001204391 is an equidigital number, since it uses as much as digits as its factorization.

401001204391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 401001204391 its reverse (193402100104), we get a palindrome (594403304495).

The spelling of 401001204391 in words is "four hundred one billion, one million, two hundred four thousand, three hundred ninety-one".