405123523420391 has 2 divisors, whose sum is σ = 405123523420392. Its totient is φ = 405123523420390.

The previous prime is 405123523420313. The next prime is 405123523420501. The reversal of 405123523420391 is 193024325321504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 405123523420391 - 2¹⁰ = 405123523419367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405123523920391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202561761710195 + 202561761710196.

It is an arithmetic number, because the mean of its divisors is an integer number (202561761710196).

Almost surely, 2^{405123523420391} is an apocalyptic number.

405123523420391 is a deficient number, since it is larger than the sum of its proper divisors (1).

405123523420391 is an equidigital number, since it uses as much as digits as its factorization.

405123523420391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 44.

Adding to 405123523420391 its reverse (193024325321504), we get a palindrome (598147848741895).

The spelling of 405123523420391 in words is "four hundred five trillion, one hundred twenty-three billion, five hundred twenty-three million, four hundred twenty thousand, three hundred ninety-one".