405128891771 has 2 divisors, whose sum is σ = 405128891772. Its totient is φ = 405128891770.

The previous prime is 405128891767. The next prime is 405128891779. The reversal of 405128891771 is 177198821504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 405128891771 - 2² = 405128891767 is a prime.

It is not a weakly prime, because it can be changed into another prime (405128891779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202564445885 + 202564445886.

It is an arithmetic number, because the mean of its divisors is an integer number (202564445886).

Almost surely, 2^405128891771 is an apocalyptic number.

405128891771 is a deficient number, since it is larger than the sum of its proper divisors (1).

405128891771 is an equidigital number, since it uses as much as digits as its factorization.

405128891771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1128960, while the sum is 53.

The spelling of 405128891771 in words is "four hundred five billion, one hundred twenty-eight million, eight hundred ninety-one thousand, seven hundred seventy-one".