400111321391 has 2 divisors, whose sum is σ = 400111321392. Its totient is φ = 400111321390.

The previous prime is 400111321273. The next prime is 400111321417. The reversal of 400111321391 is 193123111004.

It is an a-pointer prime, because the next prime (400111321417) can be obtained adding 400111321391 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400111321391 - 2³⁸ = 125233414447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400111321391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400111321091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200055660695 + 200055660696.

It is an arithmetic number, because the mean of its divisors is an integer number (200055660696).

Almost surely, 2^400111321391 is an apocalyptic number.

400111321391 is a deficient number, since it is larger than the sum of its proper divisors (1).

400111321391 is an equidigital number, since it uses as much as digits as its factorization.

400111321391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 26.

Adding to 400111321391 its reverse (193123111004), we get a palindrome (593234432395).

The spelling of 400111321391 in words is "four hundred billion, one hundred eleven million, three hundred twenty-one thousand, three hundred ninety-one".